n,k = map(int,input().split())
ans = []
cnt = 1
for i in range(2**k):
    lists = []
    cnt = 1
    for j in range(k):
        if ((i >> j) & 1):
            lists.append(1)
        else:
            lists.append(0)
    for num in lists:
        if num == 0:
            cnt -= 1
        elif num == 1:
            cnt += 1
        
        if cnt > n:
            cnt = 1
        elif cnt <= 0:
            cnt = n
        
    ans.append(cnt)
print(len(set(ans)))