#include <iostream>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <iomanip>
using namespace std;
using ll = long long;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    cout << fixed << setprecision(39) << a * c / ((long double)b) << endl;
    return 0;
}