#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = long long;

int main(){

    int T;
    cin >> T;
    while(T){
        T--;
        ll N, M, K;
        cin >> N >> M >> K;
        K %= M;
        cout << (K < M-N ? K : 0) << '\n';
    }

    return 0;
}