n, l = map(int, input().split())

is_prime = [True for i in range(10000000)]
is_prime[0], is_prime[1] = False, False
for i in range(2, 10000000):
    if is_prime[i]:
        j = 2 * i
        while j < 10000000:
            is_prime[j] = False
            j += i

R = [i for i in range(10000000)]
pr = list(filter(lambda i: is_prime[i], R))

num = 0
for i in pr:
    if (n - 1) * i <= l:
        num += l - (n - 1) * i + 1

print(num)