codeforces_1_exercises

/*------------------- DIE ROLL -------------------*/
#include <iostream>
#include <iomanip>
#include <map>

using namespace std;
map<float, string> fraction =
{
    {6.0/6.0, "1/1"},
    {5.0/6.0, "5/6"},
    {4.0/6.0, "2/3"},
    {3.0/6.0, "1/2"},
    {2.0/6.0, "1/3"},
    {1.0/6.0, "1/6"}
};

int main()
{
    int max_dice_num = 6;
    int y, w;
    cin >> y >> w;
    if (y == 1 && w == 1)
    {
        cout << "1/1";
        return 0;
    }
    int max_points = y > w? y : w;
    int cant_possible_points = max_dice_num - max_points + 1;
//    cout << cant_possible_points << " ";
//    cout << max_dice_num << " ";
    string prob = fraction[(float)cant_possible_points / (float)max_dice_num];
    //string prob = fraction[(3.0 / 6.0)];
    //cout << fixed << setprecision(2) << prob;
    cout << prob;
    return 0;
}
/*------------------- FIN DIE ROLL -------------------*/
/*------------------- TRIANGULAR NUMBERS -------------------*/
#include <iostream>

using namespace std;

int main()
{
    /*
    Me voy fijando si el número de input es igual a la suma de todos los números (empezando desde 1) hasta n,
    empezando con n = 1. Si es igual imprimo YES, si supero el número imprimo NO.
    */

    int input_num;
    cin >> input_num;
    if(input_num == 0 || input_num == 1)
    {
        cout << "YES";
        return 0;
    }
    long long sum = 3;
    int i = 1;
    while(sum < input_num)
    {
        sum = (i * (i + 1)) / 2;
        i++;
    }

    if(input_num == sum)
    {
        cout << "YES";
    } else
    {
        cout << "NO";
    }

    return 0;
}
/*------------------- FIN TRIANGULAR NUMBERS -------------------*/
/*------------------- DOMINO PILING -------------------*/
#include <iostream>

using namespace std;

int main()
{
    int m, n;
    cin >> m >> n;
    cout << (m*n)/2;
    return 0;
}
/*------------------- FIN DOMINO PILING -------------------*/
/*------------------- BLACKJACK -------------------*/
#include <iostream>
#include <map>

using namespace std;
map<int, int> values =
{
    {1, 4},
    {2, 4},
    {3, 4},
    {4, 4},
    {5, 4},
    {6, 4},
    {7, 4},
    {8, 4},
    {9, 4},
    {10, 15},
    {11, 4}
};

int main()
{
    int points;
    cin >> points;
    if(points < 11)
    {
        cout << 0;
        return 0;
    }
    cout << values[points - 10];
    return 0;
}
/*------------------- FIN BLACKJACK -------------------*/
/*------------------- PLAYING WITH DICE -------------------*/
#include <iostream>

using namespace std;

int main()
{
    int a, b;
    cin >> a >> b;
    int a_wins = 0, draw = 0, b_wins = 0;
    int a_dist = 0, b_dist = 0, dif = 0;
    for (int i = 1; i <= 6; i++)
    {
        a_dist = abs(a - i);
        b_dist = abs(b - i);
        dif = a_dist - b_dist;
        if (dif < 0)
        {
            a_wins++;
        } else if(dif > 0)
        {
            b_wins++;
        } else
        {
            draw++;
        }
    }

    cout << a_wins << " " << draw << " " << b_wins;

    return 0;
}
/*------------------- FIN PLAYING WITH DICE -------------------*/