#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

ifstream fin("asmax.in");
ofstream fout("asmax.out");

#define lim 16010
int n,m;
vector <int> G[lim];
int ini[lim],ssm[lim],viz[lim];


void dfs(int nod)
{
    viz[nod]=1;
    ssm[nod]=ini[nod];

    for(auto it:G[nod])
    {
        if(!viz[it])
        {
            dfs(it);
            ssm[nod]+=max(ssm[it],0);
        }
    }
}


int main()
{
    int x,y,i;

    fin>>n>>m;
    for(i=1; i<=n; i++)
        fin>>ini[i];

    for(i=1; i<=m; i++)
    {
        fin>>x>>y;
        G[x].push_back(y);
        G[y].push_back(x);
    }

    dfs(1);

    rez=-2000000000;
    for(i=1; i<=n; i++)
        if(ssm[i]>rez)
            rez=ssm[i];
    fout<<rez;

    return 0;
}