#include <bits/stdc++.h>   using namespace std;   long long a, b, c, d, e, f[200009], i, j, zx, xc, s, lf[200009], rg[200009],       tim, up[200009];   vector<long long> v[200009], shv[200009];   pair<long long, long long> dp[200009];   bool bo[200009], ka[200009];   bool anc(long long q, long long w) {     if (lf[q] <= lf[w] && rg[q] >= rg[w])       return 1;     else       return 0;   }   void dfs(long long q, long long w) {     bo[q] = 1;     tim++;     lf[q] = rg[q] = tim;     for (vector<long long>::iterator it = v[q].begin(); it != v[q].end(); it++) {       if (bo[(*it)] == 1 && (*it) != w) {         ka[q] = 1;       }       if (bo[(*it)] == 1) continue;       shv[q].push_back((*it));       dfs((*it), q);       if (rg[q] < rg[(*it)]) rg[q] = rg[(*it)];       if (ka[(*it)] == 1) ka[q] = 1;     }   }   void dfs2(long long q, long long w) {     up[q] = q;     for (vector<long long>::iterator it = v[q].begin(); it != v[q].end(); it++) {       if ((*it) == w) continue;       if (anc((*it), up[q]) == 1) up[q] = (*it);     }     for (vector<long long>::iterator it = shv[q].begin(); it != shv[q].end();          it++) {       dfs2((*it), w);       if (anc(up[(*it)], up[q]) == 1) up[q] = up[(*it)];     }   }   void dfs3(long long q, long long w) {     dp[q].first = 0;     dp[q].second = 0;     long long pas = 0, mx = 0, mxx = 0, ma = 0;     for (vector<long long>::iterator it = shv[q].begin(); it != shv[q].end();          it++) {       dfs3((*it), q);       pas += dp[(*it)].first;       if (mxx < dp[(*it)].second) mxx = dp[(*it)].second;       if (ma < dp[(*it)].second - dp[(*it)].first)         ma = dp[(*it)].second - dp[(*it)].first;     }     if (ka[q] == 1) {       dp[q].first = pas + f[q];     }     dp[q].second = pas + f[q] + ma;   }   int main() {     ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);     cin >> a >> b;     for (i = 1; i <= a; i++) cin >> f[i];     for (i = 1; i <= b; i++) {       cin >> c >> d;       v[c].push_back(d);       v[d].push_back(c);     }     cin >> s;     dfs(s, 0);     dfs2(s, 0);     dfs3(s, 0);     cout << dp[s].second;     return 0;   }   