#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<iomanip>
using namespace std;

int syc(long i,long Min,long Max){
	if(Min <= i && i <= Max){
		return 1;
	}else{
		exit(1);
		//return 0;
	}
}
int main(){
	double a,b,c;
	cin >> a >> b >> c;
	double ans=0;
	ans=(a/b)*c;
	cout << fixed << setprecision(8) << ans << endl; 
	
	return 0;
}