import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int t = sc.nextInt();
		int[] a = new int[m];
		int[] b = new int[m];
		for (int i = 0; i < m; i++) {
			a[i] = sc.nextInt();
			b[i] = sc.nextInt();
		}
		sc.close();

		int mod = 998244353;
		long[] ans = new long[n];
		ans[0] = 1;
		for (int i = 0; i < t; i++) {
			long[] wk = new long[n];
			for (int j = 0; j < m; j++) {
				wk[a[j]] += ans[b[j]];
				wk[b[j]] += ans[a[j]];
			}
			for (int j = 0; j < n; j++) {
				wk[j] %= mod;
			}
			ans = wk;
		}
		System.out.println(ans[0]);
	}
}