T=int(input())
for _ in range(T):
    N,S=map(str,input().split())
    N=int(N)
    S=list(S)
    S.remove('.')
    S=int(''.join(S))
    count=max(0,N-999)
    N=min(999,N)
    for n in range(1,min(1000,N+1)):
        tmp=(S+1)*n//1000-S*n//1000
        if S*n%1000==0:
            tmp+=1
        if (S+1)*n%1000==0:
            tmp-=1
        if tmp>0:
            count+=1
    print(count)