N, L = map(int, input().split())
prime = [1] * (L + 1)
ans = 0

for p in range(2, L + 1):
    num = L - p * (N - 1) + 1
    if num <= 0:
        break
    if prime[p]:
        ans += num
        for i in range(p + p, L + 1, p):
            prime[i] = 0

print(ans)