using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new long[t];
        for (var u = 0; u < t; ++u)
        {
            var l = ReadLine().Split();
            var n = long.Parse(l[0]);
            ans[u] = Math.Max(0, n - 999);
            var sx1000 = int.Parse(l[1].Replace(".", ""));
            for (var i = 1; i < 1000 && i <= n; ++i)
            {
                var totalx1000 = i * sx1000;
                var total = (totalx1000 + (1000 - totalx1000 % 1000) % 1000) / 1000;
                if (total * 1000 / i == sx1000) ++ans[u];
            }
        }
        WriteLine(string.Join("\n", ans));
    }
}