#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ll long long
using namespace std;
int main() {
	double a,b,c,ans;
	cin >> a>>b>>c;
	ans = a / b * c ;
	printf("%.10f", ans);
	cout <<  endl;
	return 0;
}