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

using ll = long long;


int main(){
    ll n,m,k,s,t;
    cin >> n >> m >> k >> s >> t;
    s--;t--;
    vector<vector<int>>g(n);
    for(int i=0;i<m;i++){
        int u,v;
        cin >> u >> v;
        u--;v--;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    if(k%2){
        cout << "Yes" << endl;
    }else{
        if(g[s].size()==0 && g[t].size()==0){
            cout << "No" << endl;
        }else{
            cout << "Yes" << endl;
        }
    }
    return 0;
}