import sys
from math import sqrt

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

    ans = 0

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

    print(ans)

def make_primes(limit):
    primes = [True] * (limit + 1)
    primes[0], primes[1] = False, False

    for p in range(2, int(sqrt(limit)) + 1):
        if not primes[p]:
            continue
        for k in range(p*p, limit + 1, p):
            primes[k] = False

    return [p for p in range(limit + 1) if primes[p]]

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()