import math
Q = int(input())

if Q > 1.2 * 10**8:
    print(0)
    exit()

ans = 0
MOD = 998244353
for N in range(1, Q + 1):
    sqrtN = math.isqrt(N)
    c = 0
    for i in range(1, sqrtN + 1):
        c += N // i
        c %= MOD
    sqrtN %= MOD
    ans += 2 * c - (sqrtN * sqrtN) % MOD
    ans %= MOD
print(ans)