from math import sqrt
N, L = map(int, input().split())
max_interval = int(L//(N-1))+1

primes = set(range(7, max_interval, 6)).union(range(5, max_interval, 6))
if max_interval > 2:
    primes.add(2)
if max_interval > 3:
    primes.add(3)

du = primes.difference_update
for i in range(5, int(sqrt(max_interval))+1, 6):
    if i in primes:
        du(range(i*3, max_interval, i*2))
    if i+2 in primes:
        du(range(i*3+6, max_interval, i*2+4))

print((L+1)*len(primes)+(1-N)*sum(primes))