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

void solve() {
    
    int N,M,K;
    cin >> N >> M >> K;
    
    if( K%M < M-N ) cout << K%M << "\n";
    else cout << "0\n";
    
}

int main() {
    
    int t;
    cin >> t;
    
    while( t-- ) {
        solve();
    }
    
}