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

cnt = 0
for key, val in enumerate(A):
    if cnt < cnt + val:
        cnt += val
    else:
        # 小さくなるときbreak
        break

    # K個で終了
    if key + 1 == K:
        break

print(cnt)