import sys
input = sys.stdin.readline

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,1500)+1):
        if (S*i)%1000==0:
            ANS+=1
        else:
            if (S*i)//1000!=(S+1)*i//1000:
                ANS+=1

    if N>1500:
        ANS+=N-1500

    print(ANS)