def solve():
    from itertools import combinations

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

    Mod1 = 998; Mod2 = 998244353
    ans = 0
    for x in combinations(range(N), r = K):
        S = sum(A[x[i]] for i in range(K))
        if S % Mod2 <= S % Mod1:
            ans += 1
    return ans % Mod1

#==================================================
print(solve())