#include #include const int Mod = 998244353; int bit[21], bit_inv[21], root[21], root_inv[21]; long long div_mod(long long x, long long y, long long z) { if (x % y == 0) return x / y; else return (div_mod((1 + x / y) * y - x, (z % y), y) * z + x) / y; } long long pow_mod(int n, int k) { long long N, ans = 1; for (N = n; k > 0; k >>= 1, N = N * N % Mod) if (k & 1) ans = ans * N % Mod; return ans; } void NTT(int k, int a[], int z[]) { if (k == 0) { z[0] = a[0]; return; } int i, d = bit[k-1]; long long tmp; int tmpp, *b = (int*)malloc(sizeof(int) * d), *c = (int*)malloc(sizeof(int) * d), *x = (int*)malloc(sizeof(int) * d), *y = (int*)malloc(sizeof(int) * d); for (i = 0; i < d; i++) { b[i] = a[i*2]; c[i] = a[i*2+1]; } NTT(k - 1, b, x); NTT(k - 1, c, y); for (i = 0, tmp = 1; i < d; i++, tmp = tmp * root[k] % Mod) { tmpp = tmp * y[i] % Mod; z[i] = x[i] + tmpp; if (z[i] >= Mod) z[i] -= Mod; z[i+d] = x[i] - tmpp; if (z[i+d] < 0) z[i+d] += Mod; } free(b); free(c); free(x); free(y); } void NTT_reverse(int k, int z[], int a[]) { if (k == 0) { a[0] = z[0]; return; } int i, d = bit[k-1]; long long tmp; int tmpp, *b = (int*)malloc(sizeof(int) * d), *c = (int*)malloc(sizeof(int) * d), *x = (int*)malloc(sizeof(int) * d), *y = (int*)malloc(sizeof(int) * d); for (i = 0; i < d; i++) { x[i] = z[i*2]; y[i] = z[i*2+1]; } NTT_reverse(k - 1, x, b); NTT_reverse(k - 1, y, c); for (i = 0, tmp = 1; i < d; i++, tmp = tmp * root_inv[k] % Mod) { tmpp = tmp * c[i] % Mod; a[i] = b[i] + tmpp; if (a[i] >= Mod) a[i] -= Mod; a[i+d] = b[i] - tmpp; if (a[i+d] < 0) a[i+d] += Mod; } free(b); free(c); free(x); free(y); } int main() { int N; scanf("%d", &N); int i, j, k, a[262145], x[262145], y[262145], ans[262145] = {}; long long fact[100001], fact_inv[100001]; for (i = 1, fact[0] = 1; i <= N; i++) fact[i] = fact[i-1] * i % Mod; for (i = N - 1, fact_inv[N] = div_mod(1, fact[N], Mod); i >= 0; i--) fact_inv[i] = fact_inv[i+1] * (i + 1) % Mod; for (k = 0, bit[0] = 1; bit[k] < N * 2; k++) bit[k+1] = bit[k] * 2; for (i = k - 1, bit_inv[k] = div_mod(1, bit[k], Mod); i >= 0; i--) bit_inv[i] = bit_inv[i+1] * 2 % Mod; for (i = k - 1, root[k] = pow_mod(3, (Mod - 1) / bit[k]), root_inv[k] = pow_mod(3, Mod - 1 - (Mod - 1) / bit[k]); i >= 0; i--) { root[i] = (long long)root[i+1] * root[i+1] % Mod; root_inv[i] = (long long)root_inv[i+1] * root_inv[i+1] % Mod; } for (i = 0; i < N - 1; i++) a[i] = fact_inv[i] * (i + 1) % Mod; for (j = N, ans[0] = fact[N-2]; j > 0; j >>= 1) { for (i = N - 1; i < bit[k]; i++) a[i] = 0; NTT(k, a, x); if ((j & 1) == 1) { NTT(k, ans, y); for (i = 0; i < bit[k]; i++) y[i] = (long long)y[i] * x[i] % Mod; NTT_reverse(k, y, ans); for (i = 0; i < N - 1; i++) ans[i] = (long long)ans[i] * bit_inv[k] % Mod; for (; i < bit[k]; i++) ans[i] = 0; } if (j > 1) { for (i = 0; i < bit[k]; i++) x[i] = (long long)x[i] * x[i] % Mod; NTT_reverse(k, x, a); for (i = 0; i < N - 1; i++) a[i] = (long long)a[i] * bit_inv[k] % Mod; } } printf("%lld\n", div_mod(ans[N-2], pow_mod(N, N - 2), Mod)); fflush(stdout); return 0; }