def enumerate_primes(n):
    result = []
    sieve = list(range(max(n + 1, 2)))
    if n < 2:
        return result
    result.append(2)
    for i in range(4, n + 1, 2):
        sieve[i] = 2
    for i in range(3, int(n ** 0.5) + 1, 2):
        if sieve[i] != i:
            continue
        result.append(i)
        for j in range(i * i, n + 1, i * 2):
            if sieve[j] == j:
                sieve[j] = i
    return result


def main():
    N, L = map(int, input().split())

    t = L // (N - 1)
    result = 0
    for d in enumerate_primes(t):
        result += L - d * (N - 1) + 1
    print(result)


main()