#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
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) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
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>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m, k;
  cin >> n >> m >> k;
  VI a(n);
  rep(i, n) cin >> a[i];
  VVI to(n);
  rep(_, m) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    if (a[u] < a[v]) swap(u, v);
    to[u].emplace_back(v);
  }
  dsu uf(n);
  vector<int> ord(n);
  iota(ord.begin(), ord.end(), 0);
  sort(ord.begin(), ord.end(), [&](int i, int j) {
    return a[i] < a[j];
  });
  for (int u : ord) {
    for (int v : to[u]) if (a[uf.leader(u)] - a[uf.leader(v)] <= k) {
      a[uf.merge(u, v)] = a[u];
    }
  }
  cout << (uf.size(0) == n ? "Yes\n" : "No\n");
}