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