import sys
input = sys.stdin.readline

eps=10**(-12)

T=int(input())
for tests in range(T):
    N,S=input().split()
    N=int(N)
    x=S.index(".")
    S=int(S[x+1:])

    ANS=0

    for i in range(1,min(N,15000)+1):
        if (S*i)%1000==0:
            ANS+=1
        else:
            if (S*i)//1000!=(S+1-eps)*i//1000:
                ANS+=1

    if N>15000:
        ANS+=N-15000

    print(ANS)