#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using namespace std;

int main(){
    int a, b, c;
    cin >> a >> b >> c;
    cout << fixed << setprecision(5) << (double)a/b*c << endl;
}