#include <bits/stdc++.h>   using namespace std;   long long n, k;   long double ans, eps = 1e-10, l, v1, v2;   bool solve(long double mid) {     int x = (n + k - 1) / k;     long double tl = mid, pos = l;     while (x--) {       if (tl < 0) return 0;       long double trav = (v2 * v1 * tl - v2 * pos) / (v1 - v2);       if (trav > pos) return 0;       long double oldTime = tl;       tl -= trav / v2 + (trav - v1 * trav / v2) / (v1 + v2);       pos -= v1 * (oldTime - tl);     }     return 1;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n >> l >> v1 >> v2 >> k;     double long hi = 1e10, lo = 0;     while (hi - lo >= eps) {       long double mid = (hi + lo) / 2;       if (solve(mid)) {         ans = mid;         hi = mid - eps;       } else         lo = mid + eps;     }     cout << setprecision(12) << ans;     solve(ans);     return 0;   }   