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#include <stdio.h>
#include <time.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <map> 
#include <string>
#include <vector>  
#include <iostream> 
#include <sstream> 
#include <queue>
#include <algorithm>

using namespace std;
 
#define ll long long
#define PB 		push_back
#define FOR(a,start,end) 	for(ll a=ll(start); a<ll(end); a++)
#define INF 		INT_MAX
#define SORT(a) 	sort(a.begin(),a.end()) 
#define CL(a,x) 		memset(a,x,sizeof(a))
#define REP(a,x)	for(ll a=0;a<x;a++)
#define REP1(a,x)	for(ll a=1;a<=x;a++)
#define MP 		make_pair

 
 
typedef vector<ll>     vi;
typedef pair<ll,ll>     pii; 
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vector<ll> > vvi;
typedef vector<vector<string> > vvs;
typedef vector<pair<string,string> > vss;
typedef pair<string,string> pss; 
typedef pair<ll,pii> ppii;
typedef vector<ppii> vppii;
typedef vector<vector<pii> > vvii;
typedef vector<vvi> vvvi;


ppii px;
vppii vc;
int i0,i,j,k,n,k1,k2,m;
ll z,c,d,t;
ll a,b; 


vi vk,vg,vig; 
vii vp,vd,vu,vp1;
vvi vvk,vvf,vvk0;	
pii p1,p2,p0; 
ll ta[100010];

int czy (int i0,vi vk0){
	int i;
	for(i=0;i<vk0.size();i++)
		if(vk0[i]==i0)
			return 1;
	return 0;
}
vii para(int ix,int i0,int a0,int b0){
	pii p0,p1;
	int i,j,i01,i02,r;
	vii vp0;

	p0=MP(ix,i0);
	r=0;
	for(int i1=vig[i0];i1<vvk[i0].size();i1++){
		//if(vvk0[i0][i1]==0){
		if(vvk[i0][i1]==ix)
			break;
		if(vg[vvk[i0][i1]]>0){
			//vvk0[i0][i1]=1;
			i01=vvk[i0][i1];

		//	if(i01==ix)
		//		break;
			if(czy(i01,vvf[b0])){
				if(i1==vig[i0])
					vig[i0]++;
				vp0=para(i0,i01,b0,a0);
				break;
			} 
			
		}
	}
	
	vp0.push_back(p0);
	return vp0;
}

vii lr(pii p1){			//p1 - para fiolek
	int i,j,i0,i02;
	vii vp1,vp0;
	pii p0;
	
	vp1.clear();

	for(i=0;i<vvf[p1.first].size();i++){
		for(int i1=vig[vvf[p1.first][i]];i1<vvk[vvf[p1.first][i]].size();i1++){
			i0=vvk[vvf[p1.first][i]][i1]; 
			//if(vvk0[vvf[p1.first][i]][i1]==0){
			if(vg[i0]>0){	
				if(czy(i0,vvf[p1.second])){		//czy jest w p1.second
					if(i1==vig[vvf[p1.first][i]])
						vig[vvf[p1.first][i]]++;
					vp0=para(vvf[p1.first][i],i0,p1.second,p1.first);	//zwraca par�
					for(int i2=0;i2<vp0.size();i2++)
						vp1.push_back(vp0[i2]);
					//break;
					//s� woelokrotne pary!
				}
			//	vvk0[vvf[p1.first][i]][i1]=1;

			}
		}
	} 
	return vp1;
} 

			
	


int main() {  
	//freopen( "c:\\wojtek\\uva\\pa\\debug\\t3.in", "rt", stdin);  
	//	ll czas=clock();
	//pi=2*acos(0.0);
	  
	//scanf("%ld",&t);

	cin>>n>>m>>k;
	vg.clear();
	vig.assign(n,0);
	for(i=0;i<n;i++){
		cin>>a;
		vg.push_back(a);
	}
	vp.clear();
	for(i=0;i<m;i++){
		cin>>a>>b;
		vp.push_back(MP(a-1,b-1));
	}
	vk.clear();
	vvk.assign(n,vk);
	vvk0.assign(n,vk);
	vvf.assign(n,vk);
	for(i=0;i<k;i++){
		cin>>a>>b;
		vvk[a-1].push_back(b-1);
		vvk[b-1].push_back(a-1);
		vvk0[a-1].push_back(0);
		vvk0[b-1].push_back(0);

	}
	z=0;
	for(i=0;i<n;i++)
		vvf[i].push_back(i);

	for(i=0;i<m;i++){
		vp1=lr(vp[i]);
		for(j=0;j<vp1.size();j++){
			a=min(vg[vp1[j].first],vg[vp1[j].second]);
			z+=2*a;

			vg[vp1[j].first]-=a;
			vg[vp1[j].second]-=a;
		}
		vk.clear();
		for(j=0;j<vvf[vp[i].first].size();j++){
			if(vg[vvf[vp[i].first][j]]>0)
				vk.push_back(vvf[vp[i].first][j]);
		}
		for(j=0;j<vvf[vp[i].second].size();j++){
			if(vg[vvf[vp[i].second][j]]>0)
				vk.push_back(vvf[vp[i].second][j]);
		}
		swap(vvf[vp[i].second],vk);
	}

	cout<<z<<endl;
		

	//czas = clock() - czas;
	//printf("%lf\n",double(czas)/CLOCKS_PER_SEC);					

			
	return 0;
	 
}