#include <fstream>
#include <vector>

using namespace std;

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

const int N = 16001;

int n;
long long s[N];
bool viz[N];
vector <int> a[N];

void citire() {
    in >> n;
    int x, y;

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

    in.close();
}

void dfs(int x) {
    viz[x] = true;

    for (int i = 0; i < a[x].size(); i++) {
        if (!viz[ a[x][i] ]) {
            dfs(a[x][i]);
            if (s[ a[x][i] ] > 0) s[x] += s[ a[x][i] ];
        }
    }
}

int main()
{
    long long m = 0;
    citire();

    for (int i = 1; i <= n; i++) {
        if (!viz[i]) dfs(i);
    }

    for (int i = 1; i <= n; i++) m = max(m, s[i]);

    out << m;
    out.close();
}