#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll =  long long ;
using P = pair<ll,ll> ;
const ll INF = 10000000000;
const int MOD = 1000000007;

int main(){
    double a,b,c;
    cin >> a >> b >> c;
    cout << setprecision(15) << (a/b) * c << endl;
    return 0;
}