#include<bits/stdc++.h>
using namespace std;
int main()
{
    float m,n,s,d;
    cin>>m>>n>>s;
	d=m*(s/n);
	cout<<d;
	return 0;
}


/**************************************************************
	Problem: 1323
	User: ccf
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/