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// Artur Kraska, II UWr

#include <algorithm>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <cmath>
#include <list>
#include <set>
#include <map>

#define forr(i, n)                  for(int i=0; i<n; i++)
#define FOREACH(iter, coll)         for(typeof(coll.begin()) iter = coll.begin(); iter != coll.end(); ++iter)
#define FOREACHR(iter, coll)        for(typeof(coll.rbegin()) iter = coll.rbegin(); iter != coll.rend(); ++iter)
#define lbound(P,R,PRED)            ({typeof(P) X=P,RRR=(R), PPP = P; while(PPP<RRR) {X = (PPP+(RRR-PPP)/2); if(PRED) RRR = X; else PPP = X+1;} PPP;})
#define testy()                     int _tests; scanf("%d", &_tests); FOR(_test, 1, _tests)
#define CLEAR(tab)                  memset(tab, 0, sizeof(tab))
#define CONTAIN(el, coll)           (coll.find(el) != coll.end())
#define FOR(i, a, b)                for(int i=a; i<=b; i++)
#define FORD(i, a, b)               for(int i=a; i>=b; i--)
#define MP                          make_pair
#define PB                          push_back
#define deb(X)                      ;
#define deb2(X)                     ;
#define deb3(X)                     X;

#define M 1000000007
#define INF 1000000007

using namespace std;

int n, m, k;
vector <pair<pair<int, int>, pair<int, int> > > res;

struct elem
{
    int o;
    int ile;
    int vol;
    int runda;
};
elem tab[200007];

int Find(int nr)
{
    while(tab[nr].o != 0)
        nr = tab[nr].o;
    return nr;
}

void Union(int a, int b, int runda)
{
    deb(cout << "w rundzie " << runda << ": " << b << " laczy sie do " << a << endl);

    tab[a].ile += tab[b].ile;
    tab[b].o = a;
    tab[b].runda = runda;
}

int main()
{
    scanf("%d %d %d", &n, &m, &k);
    FOR(i, 1, n)
    {
        scanf("%d", &tab[i].vol);
        //tab[i].o = i;
        tab[i].ile = 1;
        tab[i].runda = m+3;
    }

    int a, b;
    FOR(i, 1, m)
    {
        scanf("%d %d", &a, &b);
        a = Find(a);
        b = Find(b);

        deb(cout << " findy: " << a << " " << b << endl);

        if(a != b)
        {
            if(tab[a].ile < tab[b].ile)
                swap(a, b);

            Union(a, b, i);
        }
    }

    deb2(cout << "polaczyl wszystko" << endl);
    tab[0].runda = m+7;

    FOR(i, 1, k)
    {
        scanf("%d %d", &a, &b);
        int ela = a, elb = b, num = 0;
        while(ela != elb)
        {
            deb2(cout << " mamy " << ela << " i " << elb << " w rundze " << num << endl);

            if(tab[ela].runda < tab[elb].runda)
            {
                num = tab[ela].runda;
                ela = tab[ela].o;
                //ita++;
            }
            else
            {
                num = tab[elb].runda;
                elb = tab[elb].o;
                //ita++;
            }
        }

        deb(cout << "  " << a << " i " << b << " zostana polaczone do " << ela << " w rundzie " << num << endl);

        if(num <= m)
            res.PB(MP(MP(num, i), MP(a, b)));
    }

    deb2(cout << "zebral wyniki" << endl);

    sort(res.begin(), res.end());

    long long wynik = 0;
    FOREACH(it, res)
    {
        a = it->second.first;
        b = it->second.second;
        int minn = min(tab[a].vol, tab[b].vol);
        tab[a].vol -= minn;
        tab[b].vol -= minn;
        wynik += 2*minn;
    }

    cout << wynik << endl;

    return 0;
}