#include<iostream>
#include<algorithm>

using namespace std;

typedef unsigned long long int ull ;

ull A;
ull B;
ull C;

int main(void){
	
	cin >> A;
	cin >> B;
	cin >> C;
	
	int i = 1;
	ull money = 0;
	
	
	
	
	cout << A*(C/(A+B-1)) + min(C%(A+B-1),A) << endl;
	
	
	
	
	
	return 0;}