#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;
using ll = long long;
template<class T> using vec = vector<T>;
template<class T> using vvec = vector<vec<T>>;

int main(){
    int A,B,C;
    cin >> A >> B >> C;
    cout << fixed << setprecision(10) << 1.0*A*C/B << endl;
}