import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;

public class No1749 {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int M = scan.nextInt();
		int T = scan.nextInt();
		int MOD = 998244353;
		int[][] v = new int[N][2];
		List<List<Integer>> r = new ArrayList<List<Integer>>();
		for (int i=0; i < N; i++) {
			r.add(new ArrayList<Integer>());
		}
		for (int i=0; i < M; i++) {
			int s = scan.nextInt();
			int t = scan.nextInt();
			r.get(s).add(t);
			r.get(t).add(s);
		}
		v[0][0] = 1;
		for (int t=0; t < T; t++) {
			for (int i=0; i < N; i++) {
				v[i][(t+1) % 2] = 0;
				for (int j : r.get(i)) {
					v[i][(t+1) % 2] = (v[i][(t+1)%2] + v[j][t % 2]) % MOD;
				}
			}
		}
		System.out.println(v[0][T % 2]);
	}

}