#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
//using mint = modint998244353;
//const int mod = 998244353;
//const int INF = 1e9;
const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<long long,pair<int,int>>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
struct Edge {
	int to;
	long long cost;
	Edge(int _to, long long _cost) :to(_to), cost(_cost) {}
};
vector<Edge>g[2005];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n, m, l; cin >> n >> m >> l; l--;
	vector<int>t(n);
	rep(i, n)cin >> t[i];
	rep(i, m) {
		int a, b, c; cin >> a >> b >> c;
		a--, b--;
		g[a].push_back({ b,c });
		g[b].push_back({ a,c });
	}
	vector<vector<long long>>dp(n, vector<long long>(n, LINF));
	priority_queue<P, vector<P>, greater<P>> q;
	rep(i, n) {
		q.push({ 0, { i, i } });
		dp[i][i] = 0;
	}
	while (!q.empty()) {
		auto tmp = q.top();
		q.pop();
		long long cost = tmp.first;
		int st = tmp.second.first;
		int now = tmp.second.second;
		if (cost > dp[st][now]) continue;
		for (Edge e : g[now]) {
			long long ncost = cost + e.cost;
			int npos = e.to;
			if (chmin(dp[st][npos], ncost)) q.push({ ncost, {st,npos} });
		}
	}
	int cnt = 0;
	rep(i, n)if (0 != t[i])cnt++;
	if (1 == cnt) {
		cout << 0 << endl;
		return 0;
	}
	long long ans = LINF;
	rep(i, n) {
		long long val = dp[l][i];
		rep(j, n) {
			val += dp[i][j] * 2 * t[j];
		}
		rep(j, n) {
			if (0 == t[j])continue;
			long long sub = val;
			sub -= dp[l][i];
			sub -= dp[j][i] * 2;
			sub += dp[i][j];
			sub += dp[j][l];
			chmin(ans, sub);
		}
	}
	cout << ans << endl;
	return 0;
}