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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    long long N,M,K,s,t; cin >> N >> M >> K >> s >> t,s--,t--;
    vector<vector<int>> Graph(N);
    for(int i=0; i<M; i++){
        int u,v; cin >> u >> v;
        u--; v--;
        Graph.at(u).push_back(v);
        Graph.at(v).push_back(u);
    }
    if(K%2){cout << "Yes\n"; return 0;}
    if(Graph.at(s).size() == 0 && Graph.at(t).size() == 0 && K%2 == 0) cout << "No\n";
    else cout << "Yes\n";
}