#include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     int n;     double p[111];     cin >> n;     for (int i = 0; i < n; i++) cin >> p[i];     sort(p, p + n);     double ans = p[n - 1], notAns = 1 - p[n - 1];     for (int i = n - 2; i >= 0 && ans < notAns; i--) {       ans = ans * (1 - p[i]) + notAns * p[i];       notAns *= (1 - p[i]);     }     printf( %.12lf n , ans);   }   