#include<bits/stdc++.h> using namespace std; int main(){ int x,y,t; cin>>x>>y>>t; //int m=0,ans=0;//龟跑完全程时间 //int x=11,y=21,t=7; cout<<(t*y)/(y-x)*x; //ans=m*x; //cout<<m; return 0; }