#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count

using namespace std;

int main() {

	int T, N, M, K;
	cin >> T;

	for (int i = 0; i < T; i++) {
		cin >> N >> M >> K;

		int a = K % M;
		if (M - N > a) {
			cout << a << endl;
		}
		else {
			cout << 0 << endl;
		}

	}

	return 0;

}