import sys
from math import sqrt

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

    ans = 0

    for p in primes235(limit):
        if L - (N - 1) * p + 1 <= 0:
            break
        ans += L - (N - 1) * p + 1

    print(ans)

def primes235(limit):
    # http://rosettacode.org/wiki/Sieve_of_Eratosthenes#Factorization_wheel235_version_of_the_generator_version
    yield 2; yield 3; yield 5
    if limit < 7: return
    modPrms = [7,11,13,17,19,23,29,31]
    gaps = [4,2,4,2,4,6,2,6,4,2,4,2,4,6,2,6] # 2 loops for overflow
    ndxs = [0,0,0,0,1,1,2,2,2,2,3,3,4,4,4,4,5,5,5,5,5,5,6,6,7,7,7,7,7,7]
    lmtbf = (limit + 23) // 30 * 8 - 1 # integral number of wheels rounded up
    lmtsqrt = (int(limit ** 0.5) - 7)
    lmtsqrt = lmtsqrt // 30 * 8 + ndxs[lmtsqrt % 30] # round down on the wheel
    buf = [True] * (lmtbf + 1)
    for i in range(lmtsqrt + 1):
        if buf[i]:
            ci = i & 7; p = 30 * (i >> 3) + modPrms[ci]
            s = p * p - 7; p8 = p << 3
            for j in range(8):
                c = s // 30 * 8 + ndxs[s % 30]
                buf[c::p8] = [False] * ((lmtbf - c) // p8 + 1)
                s += p * gaps[ci]; ci += 1
    for i in range(lmtbf - 6 + (ndxs[(limit - 7) % 30])): # adjust for extras
        if buf[i]: yield (30 * (i >> 3) + modPrms[i & 7])

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()