import sys
input = sys.stdin.readline

T = int(input())
for _ in range(T):
    N, S = input().split()
    N = int(N)
    S = int(S.split(".")[1])
    ans = max(0, N - 999)
    for i in range(1, min(N+1, 1000)):
        l = (S * i + 999) // 1000
        r = ((S + 1) * i - 1) // 1000
        if l <= r:
            ans += 1
    print(ans)