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

ll N;
int S;
void solve(){
    cin >> N;
    {
        string s; cin >> s;
        s.erase(s.find('.'), 1);
        S = stoi(s);
    }
    ll X = N - min(N, 1000ll);
    N = min(N, 1000ll);
    ll ans = 0;
    for(int i = 1;i <= N;i++){
        ans += ((S + 1) * i - 1) / 1000 - (S * i - 1) / 1000;
    }
    cout << ans + X << endl;
}
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int t; cin >> t;
    while(t--)solve();
    return 0;
}