#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) { a = max(a, b); }
template<class T> void chmin(T& a, const T& b) { a = min(a, b); }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

template<class R, R (*zero)(), R (*one)()>
struct Mat: std::vector<std::vector<R>> {
    Mat(int n=0): std::vector<std::vector<R>>::vector(n, vector<R>(n, zero())) {}
    friend Mat operator*(const Mat& lhs, const Mat& rhs) {
        assert(lhs.size() == rhs.size());
        const int n = lhs.size();
        Mat ret(n);
        for(int i = 0; i < n; i++) for(int k = 0; k < n; k++) for(int j = 0; j < n; j++) {
            ret[i][j] += lhs[i][k] * rhs[k][j];
        }
        return ret;
    }
    Mat& operator*=(const Mat& rhs) {
        return (*this) = (*this) * rhs;
    }
    friend Mat operator+(const Mat& lhs, const Mat& rhs) {
        assert(lhs.size() == rhs.size());
        const int n = lhs.size();
        Mat ret(n);
        for(int i = 0; i < n; i++) for(int j = 0; j < n; j++) ret[i][j] = lhs[i][j] + rhs[i][j];
        return ret;
    }
    Mat& operator+=(const Mat& rhs) {
        return (*this) = (*this) + rhs;
    }
    Mat pow(unsigned long long n) {
        Mat A = *this;
        Mat res = Mat::I(A.size());
        for(; n; n >>= 1) {
            if (n & 1) res *= A;
            A *= A;
        }
        return res;
    }
    static Mat I(int n) {
        Mat ret(n);
        for(int i = 0; i < n; i++) ret[i][i] = one();
        return ret;
    }
};


mint zero() { return mint(); }
mint one() { return mint::raw(1); }

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  ll t;
  cin >> n >> m >> t;
  Mat<mint, zero, one> a(n);
  rep(_, m) {
    int s, t;
    cin >> s >> t;
    a[s][t] = a[t][s] = 1;
  }
  cout << a.pow(t)[0][0].val() << '\n';
}