#include <bits/stdc++.h>
//#include <chrono>
//#pragma GCC optimize("Ofast")
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()

using ll = long long;
using vec = vector<ll>;
using mat = vector<vec>;

ll N,M,H,W,Q,K,A,B;
string S;
using P = pair<ll, ll>;
const ll INF = (1LL<<60);

template<class T> bool chmin(T &a, const T b){
    if(a > b) {a = b; return true;}
    else return false;
}
template<class T> bool chmax(T &a, const T b){
    if(a < b) {a = b; return true;}
    else return false;
}
template<class T> void my_printv(std::vector<T> v,bool endline = true){
    if(!v.empty()){
        for(std::size_t i{}; i<v.size()-1; ++i) std::cout<<v[i]<<" ";
        std::cout<<v.back();
    }
    if(endline) std::cout<<std::endl;
}

class union_find{
        vector<long> parent, tree_size;
    public:
        union_find(unsigned long _n) : parent(_n), tree_size(_n, 1){
            for(unsigned long i = 0; i < _n; ++i)parent[i] = i;
        }
        ll find(ll x){
            while(parent[x] != x)x = parent[x] = parent[parent[x]];
            return x;
        }
        void merge(ll a, ll b){
            a = find(a);
            b = find(b);
	    if(a==b) return;
            if(tree_size[a] < tree_size[b])swap(a, b);
            tree_size[a] += tree_size[b];
            parent[b] = a;
            return;
        }
	bool same(ll a, ll b){
	    a = find(a);
	    b = find(b);
	    return a == b;
	}
    };
//uf.mergeのように使う
//ufはMAX_N+1でとるか、代入時に0-indexedにする

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cin>>N>>M;
    int s, t; cin>>s>>t;
    --s; --t;
    vec p(N), ord(N);
    mat G(N);
    rep(i, N) cin>>p[i];
    rep(i, M){
        int a, b; cin>>a>>b;
        --a; --b;
        G[a].push_back(b);
        G[b].push_back(a);
    }
    union_find uf(N);
    iota(ALL(ord), 0);
    sort(ALL(ord), [&](int x, int y){
        return p[x] > p[y];
    });
    ll X = p[s], res = 0;
    rep(i, N){
        int v = ord[i];
        //cout<<v<<endl;
        for(int to : G[v]){
            if(p[v] <= p[to]) uf.merge(v, to);
        }
        if(uf.same(s, v)) res += chmin(X, p[v]);
        //rep(j, N) rep(k, N) cout<<uf.same(j, k)<<" \n"[k == N - 1];
    }
    cout<<res<<endl;
}