python 代码

a,b = map(int,input().split())
ans = a - b
k = 1
cnt = 0
if a < b:
    print(0)
    exit()
elif a == b:
    print('infinity')
    exit()
else:
    while k**2 <= ans :
        if ans % k == 0:
            if k > b:
                cnt = cnt + 1
            if k != ans // k and ans // k > b:
                    cnt = cnt + 1
        k = k + 1
print(cnt)