#include <iostream>
using namespace std;
void solve(){
	int n,m,k;cin>>n>>m>>k;
	int nw = k%m;
	if(m-n > nw)cout << nw << endl;
	else cout << 0 << endl;
}
int main(){
	int n;cin>>n;
	for(int i = 0; n > i; i++)solve();
}