import itertools
from itertools import combinations

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

product = itertools.combinations(A, K)
"""for p in product:
    print(p)"""
ans = 0
for p in product:
    #print(p)
    s = sum(p)
    if s%998244353 <= s%998:
        ans += 1
    ans %= 998
ans %= 998
print(ans)