from itertools import combinations

N,K = map(int,input().split())
li = list(combinations(range(N),K))
A = list(map(int,input().split()))
ans = 0
for v in li:
	S = 0
	for u in v: S += A[u]
	if S%998 >= S%998244353: ans += 1 ; ans %= 998
print(ans)