import java.io.*;
import java.util.*;

public class Main {
    static final int MOD = 998244353;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        long t = sc.nextLong();
        ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            graph.add(new ArrayList<>());
        }
        for (int i = 0; i < m; i++) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            graph.get(a).add(b);
            graph.get(b).add(a);
        }
        long[][][] matrixes = new long[63][n][n];
        for (int i = 0; i < n; i++) {
            for (int x : graph.get(i)) {
                matrixes[0][i][x] = 1;
            }
        }
        for (int i = 1; i < 63; i++) {
            for (int a = 0; a < n; a++) {
                for (int b = 0; b < n; b++) {
                    for (int c = 0; c < n; c++) {
                        matrixes[i][a][c] += matrixes[i - 1][a][b] * matrixes[i - 1][b][c] % MOD;
                        matrixes[i][a][c] %= MOD;
                    }
                }
            }
        }
        long[] ans = new long[n];
        ans[0] = 1;
        for (int i = 62; i >= 0 && t > 0; i--) {
            if (t < (1L << i)) {
                continue;
            }
            long[] next = new long[n];
            t -= (1L << i);
            for (int j = 0; j < n; j++) {
                for (int k = 0; k < n; k++) {
                    next[j] += matrixes[i][j][k] * ans[k] % MOD;
                    next[j] %= MOD;
                }
            }
            ans = next;
        }
        System.out.println(ans[0]);
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}