func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     double n, m, a[1001], b[1001], litri = 0, ok = 1;     cin >> n >> m;     double copie = m;     for (int i = 1; i <= n; i++) cin >> a[i];     for (int i = 1; i <= n; i++) cin >> b[i];     litri = m / (b[1] - 1);     for (int i = n; i >= 1; i--) {       m = m + litri;       litri = m / (a[i] - 1);       m = m + litri;       litri = m / (b[i] - 1);       if (a[i] == 1 || b[i] == 1) ok = 0;     }     double diferenta;     diferenta = m - copie;     if (ok == 0)       cout << -1;     else       cout << fixed << setprecision(10) << diferenta;     return 0;   }   