#include<fstream>
#include<vector>
using namespace std;
const int nmax = 16000;
int n, m, val[nmax+1];
bool viz[nmax+1];
vector<int>a[nmax+1];
    ifstream fin("asmax.in");
    ofstream fout("asmax.out");

    int smaxdfs(int nod){
        int s , max = 0;
        for(int vec : a[nod]){
            if(viz[vec] == 0){
             viz[vec] = 1;
             s = smaxdfs(vec);
             if(s > max) max  = s;
        }
        val[nod] += max;
        return val[nod];
        }
    }


int main(){
    fin>>n>>m;

    for(int i = 1; i <=n; i++){
        int x;
        fin>>x;
        val[i] = x;
    }
    int x,y;
    while(fin>>x>>y){
    a[x].push_back(y);
    a[y].push_back(x);
    }

    int max = smaxdfs(1), s;
    for(int i = 1; i <= n; i++){
        s = val[i];
        if(s > max) max  = s;
    }
    fout<<max;


}