#include <bits/stdc++.h>
#define pt(sth) cout << sth << "\n"
#define itr(x,c) for(auto x=c.begin();x!=c.end();x++)
#define all(a) (a.begin()),(a.end())
using namespace std;
#include <atcoder/all>
using namespace atcoder;
typedef long long ll;
typedef pair<ll, ll> pll;
template<class T>bool chmax(T &a, const T &b) {if(a<b) {a=b; return 1;} return 0;}
template<class T>bool chmin(T &a, const T &b) {if(b<a) {a=b; return 1;} return 0;}
static const ll INF=1e18;
static const ll MAX=101010;
//static const ll MOD=1e9+7;
//static const ll MOD=998244353;
//for(i=0;i<N;i++) cin>>a[i];

typedef vector<ll> v1D;
typedef vector<v1D> v2D;
typedef vector<v2D> v3D;



int main(void) {
  ll i,j,k;
  
  ll N,M,S,T;cin>>N>>M>>S>>T;S--;T--;
  
  vector<ll> a(N);
  for(i=0;i<N;i++)cin>>a[i];
  
  vector<ll> g[MAX];
  for(i=0;i<M;i++){
    ll x,y;cin>>x>>y;x--;y--;
    g[x].push_back(y);
    g[y].push_back(x);
  }
  
  auto solve=[&](){
    ll res=0;
    ll X=a[S];
    priority_queue<pll> q;
    q.push({a[S],S});
    vector<ll> clr(N,0);
    
    while(q.size()){
      pll p=q.top();q.pop();
      ll u=p.second;
      ll d=p.first;
      
      if(clr[u]) continue;
      clr[u]=1;
      
      res+=chmin(X,d);
      
      for(auto v:g[u]) q.push({a[v],v});
    }
    
    return res;
  };
  
  pt(solve());
  
  
  
}