#include <bits/stdc++.h>

using namespace std;

typedef long long LL;

void _debug(){cerr<<'\n';}

template <typename A, typename... B>

void _debug(A a, B...b){cerr<<a<<' ', _debug(b...);}

#define debug(args...) cerr<<'('<<(#args)<<") : ", _debug(args)

const int N = 5e4+4;

int w[N], vis[N] = {}, mx = 0;

vector<int> g[N];

int dfs(int v){

    vis[v] = 1;

    int sum = 0;

    for(auto e : g[v]){

        if(vis[e]^1){

            sum += dfs(e);

        }

    }

    return sum + w[v];

}

int main(){

    int n,m; cin>>n>>m;

    for(int i = 0; i < n; i++) cin>>w[i];

    for(int i = 0; i < m; i++){

        int from, to; cin>>from>>to;

        g[from].push_back(to);

        g[to].push_back(from);

    }

    for(int i = 0; i < n; i++){

        if(vis[i]^1){

            mx = max(dfs(i), mx);

        }

    }

    cout<<mx<<'\n';

}