#include <bits/stdc++.h>
using namespace std;

long long t, n, m, u, v;
const long long M = 998244353;
typedef vector<vector<long long>> mat;

mat mprod(mat& a, mat& b) {
    mat c(a.size(), vector<long long>(b[0].size()));

    for (int i = 0; i < a.size(); i++) {
        for (int k = 0; k < b.size(); k++) {
            for (int j = 0; j < b[0].size(); j++) {
                c[i][j] = (c[i][j] + a[i][k] * b[k][j]) % M;
            }
        }
    }

    return c;
}

mat powmat(mat a, long long t) {
    mat b(a.size(), vector<long long>(a.size()));

    for (int i = 0; i < a.size(); i++)
        b[i][i] = 1;

    while (t > 0) {
        if (t & 1)
            b = mprod(b, a);

        a = mprod(a, a);
        t >>= 1;
    }

    return b;
}

int main(){
    cin >> n >> m >> t;
    
    mat a(n, vector<long long> (n, 0));
    
    for(int i = 0; i < m; i++){
        cin >> u >> v;
        
        a[u][v] = 1;
        a[v][u] = 1;
    }
    
    mat b = powmat(a, t);
            
    cout << b[0][0] << endl;
}