n,k = map(int,input().split())
from collections import defaultdict
dp = defaultdict(int)
dp[k] = 2
for i in range(2,n+1):
    ndp = dp.copy()
    for k,v in dp.items():
        ndp[k//i] += v
    dp = ndp
dp[0] = 0
print(sum(dp.values())-1)