#include <cstdio>
#include <vector>
using namespace std;

const int mod = 998244353;

struct ModInt {
    vector<int> f;
    vector<int> invf;
    ModInt(int n) {
        f.resize(n + 1);
        f[0] = 1;
        for (int i = 1; i <= n; i++) f[i] = f[i - 1] * 1ll * i % mod;
        invf.resize(n + 1);
        invf[n] = power(f[n], mod - 2);
        for (int i = n - 1; i >= 0; i--) invf[i] = invf[i + 1] * 1ll * (i + 1) % mod;
    }
    int power(int a, int b) {
        int res = 1;
        while (b) {
            if (b % 2) res = res * 1ll * a % mod;
            a = a * 1ll * a % mod;
            b /= 2;
        }
        return res;
    }
    int comb(int n, int m) {
        if (m > n || m < 0) return 0;
        return f[n] * 1ll * invf[n - m] % mod * 1ll * invf[m] % mod;
    }
};

void add(int& u, int v) {
    u += v;
    if (u >= mod) u -= mod;
}

void sub(int& u, int v) {
    u -= v;
    if (u < 0) u += mod;
}

int main() {
    int n, m, k;
    scanf("%d%d%d", &n, &m, &k);
    auto md = ModInt(n);
    if (m == 0 && k == 0) {
        printf("%d\n", md.f[n]);
        return 0;
    }
    int ans = 0;
    if (k + m <= n) {
        int left = n - m - k;
        int mul = md.f[left];
        for (int i = 1; i <= n - m - k; i++) {
            int low = m + k;
            int up = m + k + i - 1;
            int way = md.f[up];
            if (low - 1 >= 0) way = way * 1ll * md.invf[low - 1] % mod;
            way = way * 1ll * md.f[n - m - k - i] % mod;
            way = way * 1ll * md.comb(left, i) % mod;
            add(mul, way);
        }
        for (int i = 0; i <= min(m, k); i++) {
            int way = md.comb(m, i) * 1ll * md.comb(k, i) % mod * 1ll * md.f[i]% mod;
            way = way * 1ll * mul % mod;
            add(ans, way);
        }
    } else {
        for (int i = 0; i <= min(m, k); i++) {
            int way = md.comb(m, i) * 1ll * md.comb(k, i) % mod * 1ll * md.f[i] % mod;
            add(ans, way);
        }
    }
    printf("%d\n", ans);
    return 0;
}