// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")


#include<bits/stdc++.h>
using namespace std;
using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
template<class T> using V = vector<T>;
template<class T> using VV = V<V<T>>;
template<class T> using VVV = V<VV<T>>;
template<class T> using VVVV = VV<VV<T>>;
#define rep(i,n) for(ll i=0ll;(i)<(n);(i)++)
#define REP(i,a,n) for(ll i=(a);(i)<(n);(i)++)
#define rrep(i,n) for(ll i=(n)-1;(i)>=(0ll);(i)--)
#define RREP(i,a,n) for(ll i=(n)-1;(i)>=(a);(i)--)
const long long INF = (1LL << 60);
const long long mod99 = 998244353;
const long long mod107 = 1000000007;
const long long mod = mod99;
#define eb emplace_back
#define be(v) (v).begin(),(v).end()
#define all(v) (v).begin(),(v).end()
#define foa(i,v) for(auto& (i) : (v))
#define UQ(v) sort(be(v)), (v).erase(unique(be(v)), (v).end())
#define UQ2(v,cmp) sort(be(v)), (v).erase(unique(be(v),cmp), (v).end())
#define UQ3(v,cmp) sort(be(v),cmp), (v).erase(unique(be(v)), (v).end())
#define UQ4(v,cmp,cmp2) sort(be(v), cmp), (v).erase(unique(be(v),cmp2), (v).end())
#define LB(x,v) (lower_bound(be(v),(x))-(v).begin())
#define LB2(x,v,cmp) (lower_bound(be(v),(x),(cmp))-(v).begin())
#define UB(x,v) (upper_bound(be(v),(x))-(v).begin())
#define UB2(x,v,cmp) (upper_bound(be(v),(x),(cmp))-(v).begin())
#define dout()  cout << fixed << setprecision(20)
#define randinit() srand((unsigned)time(NULL))

template<class T, class U> bool chmin(T& t, const U& u) { if (t > u){ t = u; return 1;} return 0; }
template<class T, class U> bool chmax(T& t, const U& u) { if (t < u){ t = u; return 1;} return 0; }


ll Rnd(ll L=0, ll R=mod99){return rand()%(R-L)+L;}

struct UnionFind {
    vector<long long> par; 
    long long gn;
    UnionFind(long long N) : par(N, -1), gn(N){ }

    long long root(long long x) { 
        if (par[x] < 0) return x;
        return par[x] = root(par[x]);
    }

    long long size(long long x) {
        return -par[root(x)];
    }
  
    bool merge(long long x, long long y) { 
        long long rx = root(x), ry = root(y); 
        if (rx == ry) return 0; 
        gn --;
        // if (par[rx] < par[ry]) swap(rx, ry);
        par[ry] += par[rx];
        par[rx] = ry; 
        return 1;
    }

    bool same(long long x, long long y) {
        return root(x) == root(y);
    }
};

void solve(){
    ll n,m,k;
    cin >> n >> m >> k;
    V<ll> a(n);
    rep(i,n) cin >> a[i];
    // V<set<ll>> G(n);
    VV<ll> G(n);
    rep(i,m){
        ll u,v;
        cin >> u >> v;
        u--;
        v--;
        // G[u].insert(v);
        // G[v].insert(u);
        G[u].eb(v);
        G[v].eb(u);
    }
    V<ll> ord(n);
    rep(i,n) ord[i] = i;
    auto cmp = [&](const ll&i, const ll&j) -> bool {
        return a[i] < a[j];
    };
    V<ll> L = a, R = a;
    UnionFind uf(n);
    sort(be(ord), cmp);
    V<ll> seen(n, 0);
    for(auto nd:ord){
        seen[nd] = 1;
        for(auto nx:G[nd]) if(seen[nx] and uf.root(nx) != uf.root(nd)){
            nx = uf.root(nx);
            // cout << nd << " " << nx << " " << a[nd] << " " << R[nx] << endl;
            if(a[nd] - R[nx] <= k){
                // cout << nd << " " << nx << endl;
                chmin(L[nd], L[nx]);
                uf.merge(nx, nd);
                // assert(uf.root(nd) == nd);
            }
        }
    }
    if(uf.size(0) == n)  cout << "Yes" << endl;
    else cout << "No" << endl;
    
    
}





int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int t=1;
    // cin >> t;
    rep(i,t) solve();
}