#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(n);i++)
using namespace std;
typedef long long ll;
const int MOD=1e9+7;
const int MAX = 1000000;
const int INF = 1e9;
const double pi=acos(-1);
using namespace std;

int main(){
  double a,b,c;
  cin >> a>>b>>c;
  cout << fixed << setprecision(10) << a/b*c << endl;
  
  return 0;
}