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// Artur Minorczyk

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
#include <sstream>
#include <vector>
#include <list>
#include <set>
#include <map>
using namespace std;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef pair<int, int> PI;
typedef vector<PI> VPI;
typedef long long LL;
typedef vector<LL> VLL;
#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define PB push_back
#define MP make_pair
#define ST first
#define ND second
const int INF = 1000000001;
const double EPS = 10e-9;

int TreeHeight(int n)
{
	int i = 1, l = 1;
	while(l < n)
	{
		i++;
		l <<= 1;
	}
	return i;
}

template <class V, class E> struct Graph
{
    struct Ed : E
    {
        int v;
        Ed(E p = E(), int w = 0) : E(p), v(w) { }
    };
    struct Ve : V, vector<Ed> { };
    vector<Ve> g;
    VVI p;
    int t;
    Graph(int n = 0) : g(n), p(TreeHeight(n), VI(n))
    {
		t = 0;
		REP(x, n) 
		{
			g[x].n = g[x].sp = -1;
			g[x].osad = 0;
		}
	}
    void EdgeU(int b, int e, E d = E())
    {
        Ed eg(d, e);
        eg.t = t;
        g[b].PB(eg);
        eg.v = b;
        eg.t = t++;
        g[e].PB(eg);
        g[b].n = e;
    }
    VI spojne;
    void SpojnaDfs(int v, int sp)
    {
		g[v].sp = sp;
		FOREACH(it, g[v]) if(g[it->v].sp == -1) SpojnaDfs(it->v, sp);
	}
    void Spojna()
    {
		int spnr;
		REP(x, SIZE(g)) if(g[x].sp == -1) 
		{
			spnr = x;
			while(g[spnr].n != -1) spnr = g[spnr].n;
			SpojnaDfs(spnr, spnr);
			spojne.PB(spnr);
		}
	}
    void DfsV(int v)
    {
		g[v].d = ++t;
		FOREACH(it, g[v]) if(g[it->v].d == -1) DfsV(it->v);
		g[v].f = ++t;
	}
	void Dfs()
	{
		t = -1;
		Ed eg;
		REP(x, SIZE(g)) FOREACH(it, g[x]) if(it->v == g[x].n)
		{
			eg = *it;
			g[x].erase(it);
			g[x].PB(eg);
		}
		Spojna();		
		REP(x, SIZE(g)) g[x].d = g[x].f = -1;
		FOREACH(it, spojne) DfsV(*it);
		
		REP(x, SIZE(g)) if(g[x].n == -1) p[0][x] = x;
		else p[0][x] = g[x].n;
		FOR(i, 1, SIZE(p) - 1) REP(j, SIZE(g)) p[i][j] = p[i - 1][p[i - 1][j]];
	}
	bool Potomek(int u, int v)
	{
		return u == v || (g[v].d < g[u].d && g[v].f > g[u].f);
	}
	int KrawedzPotomka(int u, int v)
	{
		int p = 0, q, s;
		q = g[v].n == -1 ? SIZE(g[v]) - 1 : SIZE(g[v]) - 2;
		while(p < q)
		{
			s = (p + q) / 2;
			if(Potomek(u, g[v][s].v)) p = q = s;
			else if(g[u].f > g[g[v][s].v].f) p = s + 1;
			else q = s - 1;
		}
		return p;
	}
	void LCA(int v, int u)
	{
		if(g[v].sp != g[u].sp) return;
		int s, r;
		if(Potomek(u, v))
		{
			s = KrawedzPotomka(u, v);
			g[v][s].l.PB(MP(v, u));
		}
		else if(Potomek(v, u))
		{
			s = KrawedzPotomka(v, u);
			g[u][s].l.PB(MP(v, u));
		}
		else
		{
			int i = u, j = SIZE(p) - 1;
			while(j >= 0)
			{
				if(Potomek(v, p[j][i])) j--;
				else i = p[j][i];
			}
			s = KrawedzPotomka(v, p[0][i]);
			r = KrawedzPotomka(u, p[0][i]);
			if(g[p[0][i]][s].t > g[p[0][i]][r].t) g[p[0][i]][s].l.PB(MP(v, u));
			else g[p[0][i]][r].l.PB(MP(v, u));
		}
	}
	struct djcmp
	{
		bool operator() (const Ed a, const Ed b) const
		{
			return a.t < b.t;
		}
	};
	void Reaguj(int v, int a, int b)
	{
		int r = min(g[v].k[a], g[v].k[b]);
		g[v].osad += 2 * r;
		g[v].k[a] -= r;
		if(g[v].k[a] == 0) g[v].k.erase(a);
		g[v].k[b] -= r;
		if(g[v].k[b] == 0) g[v].k.erase(b);
	}
	void ComputeDfs(int v)
	{
		djcmp comparestr;
		FOREACH(it, g[v]) if(it->v != g[v].n) ComputeDfs(it->v);
		sort(ALL(g[v]), comparestr);
		int r = g[v].n == -1 ? SIZE(g[v]) : SIZE(g[v]) - 1;
		REP(x, r)
		{
			g[v].osad += g[g[v][x].v].osad;
			FOREACH(it, g[g[v][x].v].k) g[v].k[it->ST] = it->ND;
			FOREACH(it, g[v][x].l) Reaguj(v, it->ST, it->ND);
		}
	}
	LL Compute()
	{
		LL wynik = 0;
		FOREACH(it, spojne) 
		{
			ComputeDfs(*it);
			wynik += g[*it].osad;
		}
		return wynik;
	}
	void WriteIngredients()
	{
		REP(x, SIZE(g))
		{
			printf("%d:\n", x + 1);
			FOREACH(it, g[x].k) printf("%d => %d\n", it->ST + 1, it->ND);
		}
	}
};
struct Ve 
{
	int t;
	VPI l;
};
struct Vs
{
    int n, sp, d, f;
    map<int, int> k;
    LL osad;
};

int main()
{
	int n, m, k, b, e;
	scanf("%d%d%d", &n, &m, &k);
	Graph<Vs, Ve> g(n);
	REP(x, n)
	{
		scanf("%d", &b);
		g.g[x].k[x] = b;
	}
	REP(x, m)
	{
		scanf("%d%d", &b, &e);
		g.EdgeU(b - 1, e - 1);
	}
	g.Dfs();
	REP(x, k)
	{
		scanf("%d%d", &b, &e);
		g.LCA(b - 1, e - 1);
	}
	printf("%lld\n", g.Compute());
	return 0;
}