#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;

int main()
{
    ll t, n, m, k;
    cin >> t;
    for (ll i = 0; i < t; i++) {
        cin >> n >> m >> k;
        cout << (((k%m) > (m-n)) ? 0 : (k%m)%(m-n)) << endl;
    }
}