/* -*- coding: utf-8 -*-
 *
 * 1926.cc:  No.1926 Sequence of Remainders - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int n, m, k;
    scanf("%d%d%d", &n, &m, &k);

    k %= m;
    if (k >= m - n) k = 0;

    printf("%d\n", k);
  }
  return 0;
}