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

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

print(ans)