#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int,int>;
#define rep(i,n) for(int i=0;i<n;i++)

const ll mod = ll(1e9) + 7;
const int INF = 1<<29;

int main(){
    double a,b,c;
    cin >> a >> b >> c;
    double ans = a / b * c;
    printf("%.8lf\n",ans);
    return 0;
}