import sys
from math import sqrt

def solve():
    N, L = map(int, input().split())
    limit = L // (N - 1) + 1
    primes = rwh_primes1(limit)

    ans = 0

    for p in primes:
        if L - (N - 1) * p + 1 <= 0:
            break
        ans += L - (N - 1) * p + 1

    print(ans)

def rwh_primes1(n):
    # http://stackoverflow.com/questions/2068372/fastest-way-to-list-all-primes-below-n-in-python/3035188#3035188
    """ Returns  a list of primes < n """
    sieve = [True] * (n//2)
    for i in range(3,int(n**0.5)+1,2):
        if sieve[i//2]:
            sieve[i*i//2::i] = [False] * ((n-i*i-1)//(2*i)+1)
    return [2] + [2*i+1 for i in range(1,n//2) if sieve[i]]

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

if __name__ == '__main__':
    solve()