N, L = map(int, input().split())
M = L // (N - 1)
prime = [1] * (M + 1)
ans = max(0, L - 2 * (N - 1) + 1)

for p in range(3, M + 1, 2):
    if prime[p]:
        ans += L - p * (N - 1) + 1
        prime[p + p:M + 1:p] = [0] * ((M - p) // p)

print(ans)