func_code_string: #include <bits/stdc++.h>   using namespace std;   typedef vector<vector<int>> graph;   ifstream in( buffcraft.in , ios::in);   ofstream out( buffcraft.out , ios::out);   int main() {     double m, R, ans = 0;     cin >> m >> R;     for (int x = 2; x < m; x++)       ans += ((x - 1) * 2 + 2 * sqrt(2.0)) * 2 * (m - x);     ans += 2 * m + (2 + sqrt(2.0)) * 2 * (m - 1);     cout << setprecision(15) << ans / (m * m) * R;     return 0;   }   