#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long ll;
#define int long long
static const int mod=998244353;

signed main(){
  int n,m,t;
  cin>>n>>m>>t;
  vector<int> vec[n];
  rep(i,m){
    int s,t;
    cin>>s>>t;
    vec[s].push_back(t);
    vec[t].push_back(s);
  }
  vector<int>now(n,0);
  vector<int>pre(n,0);
  pre[0]=1;
  while(t--){
    rep(i,n){
      int sum=0;
      for(auto e:vec[i]){
        sum+=pre[e];
        sum%=mod;
      }
      now[i]=sum;
    }
    rep(i,n){
      pre[i]=now[i];
    }
  }
  cout<<pre[0]<<endl;
  
  return 0;
}