#include<bits/stdc++.h>
using namespace std;
using ll = long long;
void solve();
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int test_case;
  cin>>test_case;
  while (test_case--){
    solve();
  }
}
void solve(){
  ll N;
  string S;
  cin>>N>>S;
  ll C=0;
  for(int i=(int)S.size()-3;i<(int)S.size();i++){
    C=C*10+(S[i]-'0');
  }
  C=(1000-C)%1000;
  ll ans=max(0ll,N-1000);
  for(int i=1;i<=min(N,1000ll);i++){
    if(C*i%1000<i){
      ans+=1;
    }
  }
  cout<<ans<<'\n';
}