MOD = 998244353
T = "mole"

N = int(input())

L = len(T)
dp = [0] * (L + 1)
dp[0] = 1

for _ in range(N):
    ndp = [0] * (L + 1)

    for j in range(L + 1):
        ndp[j] = 26 * dp[j] % MOD

    for j in range(L):
        ndp[j + 1] = (ndp[j + 1] + dp[j]) % MOD

    dp = ndp

print(dp[L])