N,L = map(int,input().split())
def getPrimes(limit):
	isPrime = [True] * (limit + 1)
	isPrime[0] = isPrime[1] = False
	primes = []
	for i in range(2,limit + 1):
		if not isPrime[i]:
			continue
		if L < i * (N - 1):
			break
		j = i * 2
		while j <= limit:
			isPrime[j] = False
			j += i
		primes.append(i)
	return primes
primes = getPrimes(max(L // (N - 1),3))
ans = 0
for p in primes:
	if L < p * (N - 1):
		break
	ans += (L - p * (N - 1)) + 1
print(ans)