N, L = map(int, raw_input().split())

right = L / (N - 1)

field = [0] * (right + 1)
i = 2
ans = 0
while i <= right:
    if field[i] == 0:
        k = i * i
        while k <= right:
            field[k] = 1
            k += i
        ans += L - i * (N - 1) + 1
    if i == 2:
        i += 1
    else:
        i += 2

print ans