def solve():
    N, S = input().split()
    N = int(N); S = int(S.replace(".", ""))
    
    cnt = 0
    for i in range(1, min(N, 999) + 1):
        left = S*i; right = left + i
        if left < right // 1000 * 1000 < right:
            cnt += 1
    
    cnt += max(N - 999, 0)
    print(cnt)

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