#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
int main(){
  int N, M, T;
  cin >> N >> M >> T;
  vector<vector<int>> E(N);
  for (int i = 0; i < M; i++){
    int s, t;
    cin >> s >> t;
    E[s].push_back(t);
    E[t].push_back(s);
  }
  vector<vector<long long>> dp(T + 1, vector<long long>(N, 0));
  dp[0][0] = 1;
  for (int i = 0; i < T; i++){
    for (int j = 0; j < N; j++){
      for (int k : E[j]){
        dp[i + 1][k] += dp[i][j];
        dp[i + 1][k] %= MOD;
      }
    }
  }
  cout << dp[T][0] << endl;
}