func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, l, v1, v2, k;   int main() {     cin >> n >> l >> v1 >> v2 >> k;     long double T = 0;     long double S = l, t1, t2, d;     int m = ((n + k - 1) / k);     S = S / ((long double)(m) - ((long double)(m - 1) * (v2 - v1)) / (v2 + v1));     t1 = S / v2;     t2 = (S * (v2 - v1)) / (v2 + v1) / v2;     T = t1 * m + t2 * (m - 1);     cout << fixed << setprecision(15) << T;   }   