Trunks.py

def R(sum, pred, last):
    global ans
    if sum==0: ans+=1
    elif sum>0:
        if pred<last:
            for i in range(1, last): R(sum-i, last, i)
        else:
            for i in range(last+1, sum+1): R(sum-i, last, i)

n,k = map(int,input().split())
if n==k: print(1)
else:
    ans=0
    for i in range(1, n-k+1):
        if i!=k: R(n-k-i, k, i)
    print(ans)