#include <bits/stdc++.h>
using namespace std;
int main() {
	int A, B, T;
	cin >> A >> B >> T;
	int ans = INT_MAX;
	if(A < B) {
		int tmp = A;
		A = B;
		B = tmp;
	}
	for(int i = 0; i <= T; i += A) {
		ans = min(ans, (B - ((T - i) % B)) % B);
	}
	cout << ans + T << endl;
	return 0;
}