n, k = read_line.split.map &.to_i64
a = read_line.split.map &.to_i64

ans = a.each_combination(k).count { |sub|
  s998 = sub.reduce(0_i64) { |acc, i| (acc + i) % 998 }
  s998244353 = sub.reduce(0_i64) { |acc, i| (acc + i) % 998244353 }
  s998244353 <= s998
} % 998

puts ans