#include <iostream>
#include <algorithm>
#include <cmath>
#include <string>
#include <cstdlib>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <iomanip>

#define SWS ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define pb push_back
#define ppb pop_back
#define ft first
#define sd second
#define read freopen("input.txt", "r", stdin)
#define write freopen("output.txt", "w", stdout)
#define files read; write

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int Z = (int)5e3 + 228;
const int N = (int)2e5 + 228;
const int INF = (int)1e9 + 228;
const int MOD = (int)1e9 + 7;

int convert(string& s)
{
    int res = 0, pos, n = s.length();
    for (int i = 0; i < n; i++)
        if (s[i] >= '0' && s[i] <= '9') res = res * 10 + (int)(s[i] - '0');
        else
        {
            pos = i;
            break;
        }
    string t = s.substr(pos, n - pos);
    int x;
    if (t == "mile") x = 1609;
    if (t == "km") x = 1000;
    if (t == "uin") x = 33;
    if (t == "kairi") x = 1852;
    if (t == "zhang") x = 3;
    if (t == "sen") x = 38;
    return res * x;
}

bool check(int a, int b, int c)
{
    int sum = a + b + c;
    int mx = max(a, max(b, c));
    return mx < sum - mx;
}

double get_square(double a, double b, double c)
{
    double p = (a + b + c) / 2;
    return sqrt(p * (p - a) * (p - b) * (p - c));
}

int main()
{
    SWS;
    //files;
    int n;
    cin >> n;
    vector<pii> a;
    for (int i = 0; i < n; i++)
    {
        string s;
        cin >> s;
        int x = convert(s);
        a.pb({x, i});
    }
    sort(a.begin(), a.end());
    double ans = 0;
    int num1, num2, num3;
    for (int i = 0; i < n; i++)
        if (i + 2 < n)
            if (check(a[i].ft, a[i + 1].ft, a[i + 2].ft))
                if (get_square((double)a[i].ft, (double)a[i + 1].ft, (double)a[i + 2].ft) > ans)
                {
                    ans = get_square((double)a[i].ft, (double)a[i + 1].ft, (double)a[i + 2].ft);
                    num1 = a[i].sd + 1;
                    num2 = a[i + 1].sd + 1;
                    num3 = a[i + 2].sd + 1;
                    //if (num1 == 7 && num2 == 1 && num3 == 5)
                    //  cout << a[i].ft << ' ' << a[i + 1].ft << ' ' << a[i + 2].ft << endl;
                }
    cout << fixed << setprecision(30) << ans / 4 << "\n";
    cout << num1 << ' ' << num2 << ' ' << num3;
    return 0;
}