IsPrime = [True for _ in range(10**7 + 1)]
IsPrime[0] = IsPrime[1] = False
Primes = []
for p in range(2, 10**7 + 1):
    if IsPrime[p]:
        Primes.append(p)
        for i in range(p * p, 10**7 + 1, p):
            IsPrime[i] = False

n, l = map(int, input().split())
ans = 0
for p in Primes:
    if p * (n - 1) > l:
        break
    ans += l - p * (n - 1) + 1
print(ans)