#include <bits/stdc++.h>   using namespace std;   const int maxn = 1e5 + 5;   inline int read() {     int x = 0;     int f = 1, hhh = getchar();     while (!isdigit(hhh)) {       if (hhh ==  - ) f = -1;       hhh = getchar();     }     while (isdigit(hhh)) {       x = x * 10 + hhh -  0 ;       hhh = getchar();     }     return x * f;   }   int n, l, v1, v2, k;   int main() {     n = read();     l = read();     v1 = read();     v2 = read();     k = read();     int m = ceil(n * 1.0 / k);     double t = 1.0 * (m - 1) * (v2 - v1) / (v1 + v2);     double t2 = 1.0 * l / v2 / (m - t);     double t1 = 1.0 * (l - t2 * v2) / v1;     printf( %f n , t1 + t2);     return 0;   }   