#include<bits/stdc++.h>
using namespace std;
using Int = long long;

struct Precision{
  Precision(){
    cout<<fixed<<setprecision(12);
  }
}precision_beet;

//INSERT ABOVE HERE
signed main(){
  Int n;
  double g,v;
  cin>>n>>g>>v;
  cout<<(n/5)*g/v<<endl;
  return 0;
}