#include<bits/stdc++.h>
#include<atcoder/all>
using namespace atcoder;
using mint=modint998244353;
using namespace std;
using ll=long long;
using ull=unsigned long long;
#define rep(i,a,b) for(ll i=(ll)(a);i<(ll)(b);i++)
#define rrep(i,a,b) for(ll i=(ll)(a-1);i>=(ll)(b);i--)
#define MOD 998244353
//#define MOD 1000000007
#define INF 1e18
#define Pair pair<ll,ll>
//#define PI numbers::pi
//#define E numbers::e
template <typename T> bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template <typename T> bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
ll dx[4]={0,1,0,-1};
ll dy[4]={1,0,-1,0};

int main(){
    ll t; cin >> t;
    while(t--){
        ll n; cin >> n;
        long double s; cin >> s;
        vector<ll> p;
        rep(i,1,1001){
            ll a=ceil(s*i),b=ceil((s+0.001)*i);
            if(a<b) p.push_back(i);
        }
        ll x=n/1000,y=n%1000;
        cout << p.size()*x+distance(p.begin(),upper_bound(p.begin(),p.end(),y)) << endl;
    }
}