#include <iostream>
#include <fstream>
#include <sstream>
#include <cstdio>
#include <algorithm>
#include <set>
#include <map>
#include <vector>
#include <stack>
#include <queue>
#include <cstring>
#include <cstdio>
#include <ctime>
#include <cmath>
#include <iomanip>
#include <complex>
#include <utility>

using namespace std;

typedef long long LL;
typedef long double LD;

const int STEP = 100000;
const LD PRECALC[] =
{
0.0,
12.09014613,
12.78329081,
13.18875509,
13.47643674,
13.69958004,
13.88190143,
14.03605199,
14.16958330,
14.28736626,
14.39272672,
14.48803686,
14.57504820,
14.65509087,
14.72919882,
14.79819166,
14.86273016,
14.92335477,
14.98051317,
15.03458037,
15.08587365,
15.13466381,
15.18118381,
15.22563556,
15.26819517,
15.30901715,
15.34823786,
15.38597818,
15.42234582,
15.45743713,
15.49133868,
15.52412850,
15.55587719,
15.58664884,
15.61650180,
15.64548933,
15.67366021,
15.70105918,
15.72772742,
15.75370290,
15.77902071,
15.80371332,
15.82781087,
15.85134136,
15.87433088,
15.89680373,
15.91878264,
15.94028884,
15.96134224,
15.98196153,
16.00216424,
16.02196686,
16.04138494,
16.06043314,
16.07912527,
16.09747441,
16.11549291,
16.13319249,
16.15058423,
16.16767866,
16.18448578,
16.20101508,
16.21727560,
16.23327594,
16.24902429,
16.26452848,
16.27979595,
16.29483382,
16.30964891,
16.32424771,
16.33863644,
16.35282108,
16.36680732,
16.38060064,
16.39420629,
16.40762931,
16.42087454,
16.43394662,
16.44685002,
16.45958905,
16.47216783,
16.48459035,
16.49686044,
16.50898180,
16.52095799,
16.53279245,
16.54448848,
16.55604931,
16.56747800,
16.57877756,
16.58995086,
16.60100069,
16.61192976,
16.62274068,
16.63343597,
16.64401807,
16.65448937,
16.66485216,
16.67510866,
16.68526103,
16.69531137,
16.70526170,
16.71511399,
16.72487017,
16.73453208,
16.74410153,
16.75358027,
16.76297001,
16.77227240,
16.78148906,
16.79062154,
16.79967138,
16.80864005,
16.81752899,
16.82633962,
16.83507330,
16.84373136,
16.85231511,
16.86082580,
16.86926466,
16.87763291,
16.88593172,
16.89416222,
16.90232553,
16.91042274,
16.91845491,
16.92642308,
16.93432826,
16.94217143,
16.94995357,
16.95767562,
16.96533849,
16.97294309,
16.98049030,
16.98798097,
16.99541595,
17.00279605,
17.01012209,
17.01739485,
17.02461510,
17.03178359,
17.03890106,
17.04596822,
17.05298580,
17.05995446,
17.06687491,
17.07374779,
17.08057375,
17.08735344,
17.09408747,
17.10077646,
17.10742100,
17.11402168,
17.12057908,
17.12709376,
17.13356628,
17.13999717,
17.14638697,
17.15273619,
17.15904536,
17.16531498,
17.17154553,
17.17773750,
17.18389136,
17.19000759,
17.19608663,
17.20212895,
17.20813497,
17.21410514,
17.22003987,
17.22593960,
17.23180472,
17.23763564,
17.24343275,
17.24919646,
17.25492713,
17.26062515,
17.26629089,
17.27192471,
17.27752696,
17.28309801,
17.28863819,
17.29414784,
17.29962731,
17.30507691,
17.31049698,
17.31588783,
17.32124977,
17.32658312,
17.33188817,
17.33716523,
17.34241458,
17.34763653,
17.35283134,
17.35799931,
17.36314071,
17.36825581,
17.37334488,
17.37840819,
17.38344598,
17.38845852,
17.39344606,
17.39840885,
17.40334713,
17.40826115,
17.41315113,
17.41801732,
17.42285995,
17.42767923,
17.43247541,
17.43724868,
17.44199929,
17.44672743,
17.45143332,
17.45611717,
17.46077918,
17.46541956,
17.47003851,
17.47463622,
17.47921288,
17.48376870,
17.48830385,
17.49281853,
17.49731292,
17.50178720,
17.50624155,
17.51067615,
17.51509117,
17.51948678,
17.52386316,
17.52822046,
17.53255886,
17.53687852,
17.54117960,
17.54546227,
17.54972667,
17.55397296,
17.55820129,
17.56241182,
17.56660470,
17.57078007,
17.57493808,
17.57907888,
17.58320259,
17.58730938,
17.59139936,
17.59547269,
17.59952949,
17.60356990,
17.60759405,
17.61160207,
17.61559409,
17.61957024,
17.62353064,
17.62747542,
17.63140469,
17.63531859,
17.63921723,
17.64310073,
17.64696921,
17.65082278,
17.65466156,
17.65848565,
17.66229518,
17.66609025,
17.66987097,
17.67363746,
17.67738981,
17.68112813,
17.68485253,
17.68856311,
17.69225997,
17.69594321,
17.69961294,
17.70326925,
17.70691225,
17.71054201,
17.71415865,
17.71776226,
17.72135293,
17.72493075,
17.72849582,
17.73204822,
17.73558805,
17.73911539,
17.74263033,
17.74613296,
17.74962336,
17.75310163,
17.75656784,
17.76002207,
17.76346441,
17.76689495,
17.77031376,
17.77372091,
17.77711650,
17.78050060,
17.78387329,
17.78723463,
17.79058472,
17.79392362,
17.79725141,
17.80056816,
17.80387395,
17.80716885,
17.81045292,
17.81372625,
17.81698889,
17.82024093,
17.82348242,
17.82671344,
17.82993406,
17.83314433,
17.83634434,
17.83953413,
17.84271378,
17.84588336,
17.84904292,
17.85219253,
17.85533225,
17.85846214,
17.86158227,
17.86469269,
17.86779347,
17.87088466,
17.87396633,
17.87703853,
17.88010132,
17.88315475,
17.88619890,
17.88923380,
17.89225952,
17.89527611,
17.89828363,
17.90128214,
17.90427168,
17.90725230,
17.91022408,
17.91318704,
17.91614125,
17.91908676,
17.92202362,
17.92495188,
17.92787159,
17.93078280,
17.93368556,
17.93657992,
17.93946592,
17.94234362,
17.94521307,
17.94807430,
17.95092737,
17.95377232,
17.95660920,
17.95943806,
17.96225893,
17.96507187,
17.96787693,
17.97067413,
17.97346353,
17.97624518,
17.97901910,
17.98178536,
17.98454398,
17.98729501,
17.99003850,
17.99277448,
17.99550299,
17.99822408,
18.00093779,
18.00364415,
18.00634321,
18.00903500,
18.01171956,
18.01439694,
18.01706717,
18.01973029,
18.02238633,
18.02503534,
18.02767735,
18.03031240,
18.03294052,
18.03556175,
18.03817613,
18.04078370,
18.04338448,
18.04597851,
18.04856584,
18.05114648,
18.05372049,
18.05628788,
18.05884870,
18.06140298,
18.06395075,
18.06649205,
18.06902691,
18.07155535,
18.07407742,
18.07659315,
18.07910256,
18.08160569,
18.08410257,
18.08659323,
18.08907770,
18.09155602,
18.09402821,
18.09649430,
18.09895433,
18.10140832,
18.10385630,
18.10629830,
18.10873436,
18.11116449,
18.11358873,
18.11600712,
18.11841966,
18.12082640,
18.12322736,
18.12562257,
18.12801206,
18.13039585,
18.13277398,
18.13514646,
18.13751332,
18.13987460,
18.14223031,
18.14458049,
18.14692515,
18.14926434,
18.15159806,
18.15392635,
18.15624923,
18.15856673,
18.16087887,
18.16318568,
18.16548717,
18.16778338,
18.17007434,
18.17236005,
18.17464055,
18.17691587,
18.17918602,
18.18145102,
18.18371091,
18.18596570,
18.18821542,
18.19046009,
18.19269974,
18.19493437,
18.19716403,
18.19938872,
18.20160848,
18.20382332,
18.20603327,
18.20823834,
18.21043856,
18.21263395,
18.21482453,
18.21701032,
18.21919135,
18.22136763,
18.22353918,
18.22570603,
18.22786819,
18.23002569,
18.23217855,
18.23432677,
18.23647040,
18.23860944,
18.24074391,
18.24287384,
18.24499923,
18.24712013,
18.24923653,
18.25134846,
18.25345594,
18.25555899,
18.25765763,
18.25975187,
18.26184174,
18.26392724,
18.26600841,
18.26808525,
18.27015779,
18.27222605,
18.27429003,
18.27634976,
18.27840526,
18.28045655,
18.28250363,
18.28454653,
18.28658527,
18.28861986,
18.29065031,
18.29267666,
18.29469890,
18.29671707,
18.29873117,
18.30074122,
18.30274724,
18.30474924,
18.30674724,
18.30874126,
18.31073131,
18.31271741,
18.31469957,
18.31667781,
18.31865214,
18.32062259,
18.32258916,
18.32455187,
18.32651073,
18.32846576,
18.33041698,
18.33236441,
18.33430804,
18.33624791,
18.33818401,
18.34011638,
18.34204502,
18.34396995,
18.34589118,
18.34780873,
18.34972260,
18.35163282,
18.35353940,
18.35544235,
18.35734169,
18.35923742,
18.36112957,
18.36301815,
18.36490316,
18.36678463,
18.36866256,
18.37053698,
18.37240789,
18.37427530,
18.37613923,
18.37799970,
18.37985671,
18.38171028,
18.38356042,
18.38540714,
18.38725046,
18.38909039,
18.39092693,
18.39276011,
18.39458994,
18.39641643,
18.39823958,
18.40005942,
18.40187595,
18.40368919,
18.40549914,
18.40730583,
18.40910925,
18.41090943,
18.41270638,
18.41450010,
18.41629061,
18.41807792,
18.41986204,
18.42164299,
18.42342077,
18.42519539,
18.42696687,
18.42873522,
18.43050044,
18.43226256,
18.43402157,
18.43577750,
18.43753035,
18.43928013,
18.44102686,
18.44277053,
18.44451118,
18.44624880,
18.44798341,
18.44971501,
18.45144362,
18.45316924,
18.45489190,
18.45661159,
18.45832832,
18.46004212,
18.46175299,
18.46346093,
18.46516596,
18.46686809,
18.46856732,
18.47026368,
18.47195716,
18.47364777,
18.47533554,
18.47702046,
18.47870254,
18.48038181,
18.48205825,
18.48373189,
18.48540274,
18.48707079,
18.48873607,
18.49039858,
18.49205833,
18.49371534,
18.49536960,
18.49702112,
18.49866993,
18.50031602,
18.50195941,
18.50360010,
18.50523810,
18.50687342,
18.50850607,
18.51013607,
18.51176341,
18.51338810,
18.51501016,
18.51662960,
18.51824641,
18.51986062,
18.52147222,
18.52308123,
18.52468766,
18.52629151,
18.52789279,
18.52949151,
18.53108768,
18.53268130,
18.53427239,
18.53586096,
18.53744700,
18.53903053,
18.54061156,
18.54219009,
18.54376614,
18.54533970,
18.54691079,
18.54847942,
18.55004559,
18.55160931,
18.55317059,
18.55472944,
18.55628586,
18.55783986,
18.55939145,
18.56094064,
18.56248743,
18.56403183,
18.56557385,
18.56711350,
18.56865078,
18.57018570,
18.57171827,
18.57324849,
18.57477637,
18.57630193,
18.57782516,
18.57934607,
18.58086467,
18.58238097,
18.58389498,
18.58540669,
18.58691613,
18.58842329,
18.58992818,
18.59143081,
18.59293118,
18.59442931,
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18.60337125,
18.60485383,
18.60633421,
18.60781241,
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18.61076226,
18.61223394,
18.61370344,
18.61517080,
18.61663600,
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18.62538241,
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18.62828096,
18.62972709,
18.63117114,
18.63261310,
18.63405298,
18.63549080,
18.63692655,
18.63836024,
18.63979188,
18.64122147,
18.64264902,
18.64407454,
18.64549803,
18.64691949,
18.64833894,
18.64975637,
18.65117180,
18.65258523,
18.65399666,
18.65540611,
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18.66102410,
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18.66521698,
18.66661071,
18.66800249,
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18.67216628,
18.67355036,
18.67493253,
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18.67769115,
18.67906761,
18.68044218,
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18.70218217,
18.70352535,
18.70486674,
18.70620632,
18.70754411,
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18.93920742,
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};

LD harm(int n)
{
	int ndx = n / STEP;
	LD ret = PRECALC[ndx];
	for (int i = ndx * STEP + 1; i <= n; ++i)
		ret += (LD)1 / i;
	return ret;
}

int main()
{
#ifdef _DEBUG
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif

	int test = 0;
	while (true)
	{
		test++;

		int W, L;
		cin >> W >> L;
		if (W == 0 && L == 0) break;

		cout << "Case " << test << ": \n";

		int down = max(L, (W + L + 7) / 8);
		int up = W / 8 + L;
		if (down > up)
		{
			cout << "Situation Impossible.\n";
			continue;
		}

		LD h = 0.0;
		h = harm(up) - harm(down - 1);

		LD ans = (W + L) * h / (up - down + 1);

		cout << "On Average Bob Reaches Round " << fixed << setprecision(2) << ans << '\n';
	}

	return 0;
}