MOD = 998244353i64

def inv(v : Int64)
  pow(v, MOD - 2)
end

def pow(v : Int64, p)
  ret = 1i64
  while p > 0
    if (p & 1i64) != 0
      ret *= v
      ret %= MOD
    end
    v *= v
    v %= MOD
    p >>= 1
  end
  ret
end

n = read_line.to_i64
ans = n * (n - 1) % MOD * (n - 2) % MOD * (n - 3) % MOD * inv(24i64) % MOD
ans *= pow(26i64, n - 4)
puts ans % MOD