#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000000

int main(){
	
	double A,B,C;
	cin>>A>>B>>C;
	
	A /= B;
	
	A *= C;
	
	cout<<fixed<<setprecision(10)<<A<<endl;
	
	return 0;
	
}