#include <bits/stdc++.h>
using namespace std;

int64_t gcd(int64_t a, int64_t b) {
	int c;
	while(a) {
		c = a; a = b%a; b = c;
	}
	return b;
}

int64_t lcm(int64_t a, int64_t b) {
	return (a / gcd(a, b) * b);
}

int main() {
	int64_t A, B, T;
	cin >> A >> B >> T;
	int64_t ans = INT_MAX;
	if(A < B) {
		int64_t tmp = A;
		A = B;
		B = tmp;
	}
	int64_t l = lcm(A, B);
	int64_t t = T % l;
	for(int64_t i = 0; i <= t; i += A) {
		ans = min(ans, (B - ((t - i) % B)) % B);
	}
	cout << ans + T << endl;
	return 0;
}