N = 10000010
isprime = [True] * N
isprime[0] = isprime[1] = False
for i in range(2, int(N ** 0.5 + 1)):
    if not isprime[i]:
        continue
    for j in range(i * i, N, i):
        isprime[j] = False

n, l = map(int, input().split())
ans = 0
for d in range(l):
    if not isprime[d]:
        continue
    x = d * (n - 1)
    ans += max(0, l - x + 1)
print(ans)