def solve():
    n, s = map(float, input().split())
    n = int(n)
    s = round(s * 1000)
    s %= 1000
    ans = max(0, n - 1000)
    n = min(n, 1000)

    for k in range(1, n + 1):
        x = (k * (s + 1) - 1) // 1000
        if k * s <= 1000 * x:
            ans += 1
    print(ans)


for _ in range(int(input())):
    solve()