#include <cstdio>
#include <iostream>
#include <string>
#define rep( i, n, m ) for(int i = ( n ); i < ( m ); i++)

typedef unsigned long long int ll;

int main( void ){
	ll a, b, c;
	if (!scanf( "%lld%lld%lld", &a, &b, &c ))
		return 0;
	ll time = c / (( a - 1 ) + b );
	ll age = a * time;
	ll money = (( a - 1 ) + b ) * time;
	if (money < c){
		age += c - money;
		money += c - money;
		if (c - money < a-1)
			age += c - money;
		else
			age+=a;
	}
	printf( "%lld\n", age );
	return 0;
}