#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
	int a, b, t; cin >> a >> b >> t;
	if (a > b)swap(a, b);

	int mn = 1000000001;
	int x;
	for (int i = 0; i*b <= t; i++){
		mn = min(mn, (a - (t - i*b) % a)%a);
		//cout << mn << endl;
	}

	cout << mn + t << endl;

	return 0;
}