N,L = map(int,input().split())
def getPrimes():
	isPrime = [True for i in range(10000000 // (N - 1)+ 1)]
	isPrime[0] = isPrime[1] = False
	primes = []
	for i in range(2,10000000 // (N - 1)+ 1):
		if not isPrime[i]:
			continue
		j = 2
		while i * j <= 10000000 // (N - 1):
			isPrime[i * j] = False
			j += 1
		primes.append(i)
	return primes
primes = getPrimes()
ans = 0
for p in primes:
	if L < p * (N - 1):
		break
	ans += (L - p * (N - 1)) + 1
print(ans)