#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001LL

int main(){
	
	int N,M,K;
	cin>>N>>M>>K;
	
	vector<int> a(N);
	rep(i,N)cin>>a[i];
	
	vector<vector<int>> e(M);
	rep(i,M){
		int u,v;
		cin>>u>>v;
		u--,v--;
		e[i] = {max(a[u],a[v]),u,v};
	}
	sort(e.begin(),e.end());
	dsu D(N);
	rep(i,M){
		int x = D.leader(e[i][1]),y = D.leader(e[i][2]);
		if(x==y)continue;
		if(e[i][0] - min(a[x],a[y]) > K)continue;
		int nl = D.merge(x,y);
		a[nl] = e[i][0];
	}
	
	set<int> S;
	rep(i,N){
		S.insert(a[D.leader(i)]);
	}
	cout<<(S.size()==1 ? "Yes":"No")<<endl;
	
	return 0;
}