#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vmi = vector<mint>;
using vvmi = vector<vmi>;
using vvvmi = vector<vvmi>;
#define all(a) (a).begin(), (a).end()
#define rep2(i, m, n) for (int i = (m); i < (n); ++i)
#define rep(i, n) rep2(i, 0, n)
#define drep2(i, m, n) for (int i = (m)-1; i >= (n); --i)
#define drep(i, n) drep2(i, n, 0)


int main(){
    int n, m; ll k; int s, t; cin >> n >> m >> k >> s >> t;
    vi d(n+1, 0);
    rep(i, m){
        int u, v; cin >> u >> v;
        d[u]++;
        d[v]++;
    }
    if(k % 2 != 0 || d[t] > 0){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }

    return 0;
}