#include <iostream>
using namespace std;
typedef long long LL;
int main(int argc, char* argv[])
{
	LL A,B,C;
	cin>>A>>B>>C;
	if (C<A){
		cout<<C<<endl;
		return 0;
	}
	LL year=A-1;
	LL money=0;
	while(true){
		if (year%A==0){
			money+=B;
		}else{
			money++;
		}
		if (money>=C){
			cout<<year<<endl;
			return 0;
		}
		year++;
	}
	return 0;
}