from itertools import combinations

N,K=map(int,input().split())
A=list(map(int,input().split()))

L=list(combinations(range(N),K))

ANS=0
for i in L:
    score=0

    for j in i:
        score+=A[j]


    if score%998>=score%998244353:
        ANS+=1

print(ANS%998)