#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD = 998244353;
using P = pair<int,int>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()

int main(){
    int n,m,t;
    cin >> n >> m >> t;
    vector<vector<int>> st(m,vector<int>(2));
    rep(i,m){
        cin >> st[i][0] >> st[i][1];
    }
    vector<vector<ll>> dp(t+1,vector<ll>(n,0));
    dp[0][0] = 1;
    rep(i,t){
        rep(j,m){
            dp[i+1][st[j][1]] += dp[i][st[j][0]];
            dp[i+1][st[j][0]] += dp[i][st[j][1]];
        }
        rep(j,n) dp[i+1][j] %= MOD;
    }
    cout << dp[t][0] << endl;
    return 0;
}