最简单代码（python)

解题思路:就是求几个1+2+....的和

注意事项:注意min函数那里，代表着有几个1+2+...

参考代码:

k,w = map(int, input().split())

if w%k == 0:

    wei = w/k

else:

    wei = int(w/k)+1

sum1 = 0

for i in range(min([2**k-2,wei-1])):

    for j in range(1,(2**k)-i-1):

        sum1 += j

print(sum1)