#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #include <algorithm> #include <utility> #include <functional> #include <cstring> #include <queue> #include <stack> #include <math.h> #include <iterator> #include <vector> #include <string> #include <set> #include <math.h> #include <iostream> #include<map> #include <stdlib.h> #include <list> #include <typeinfo> #include <list> #include <set> #include <iomanip> using namespace std; #define MAX_MOD 1000000007 #define REP(i,n) for(int i = 0;i < n;++i) #define M_PI 3.14159265359 int main() { long long n, g, v; cin >> n >> g >> v; long long how_great = (n/5); how_great *= g; double ans = (double)how_great / (double)v; cout <<fixed << setprecision(13) << ans << endl; cin >> n; }