N,P = map(int,input().split())

div = [[] for _ in range(N + 1)]
for i in range(2,N):
    for j in range(2 * i,N + 1,i):
        div[j].append(i)
ans = 0
stack = [P]
memo = [0] * (N + 1)
memo[P] = 1
while stack:
    now = stack.pop()
    ans += 1
    for d in div[now]:
        if memo[d] == 0:
            stack.append(d)
            memo[d] = 1
    for j in range(2 * now,N + 1,now):
        if memo[j] == 0:
            memo[j] = 1
            stack.append(j)
print(ans)