import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int h = sc.nextInt();
		int w = sc.nextInt();
		int m = sc.nextInt();
		sc.close();

		int mod = 998244353;
		long[] ph = new long[m + 1];
		long[] pw = new long[m + 1];
		for (int i = 1; i <= m; i++) {
			ph[i] = power(i, h, mod);
			pw[i] = power(i, w, mod);
		}

		long ans = 0;
		for (int i = 1; i <= m; i++) {
			long v1 = ph[i] - ph[i - 1] + mod;
			v1 %= mod;
			long v2 = pw[i] - pw[i - 1] + mod;
			v2 %= mod;
			long v = v1 * v2 % mod;
			ans += v;
		}
		ans %= mod;
		System.out.println(ans);
	}

	static long power(long x, long n, int m) {
		if (n == 0) {
			return 1;
		}
		long val = power(x, n / 2, m);
		val = val * val % m;
		if (n % 2 == 1) {
			x %= m;
			val = val * x % m;
		}
		return val;
	}
}