#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

typedef long long Weight;
struct Edge {
    int from, to;
    Weight wei;
    Edge(int from_, int to_, Weight wei_) :from(from_), to(to_), wei(wei_) {}
};
typedef vector<Edge> Edges;
typedef vector<Edges> Graph;
const Weight INFW = numeric_limits<Weight>::max();

vector<Weight> dijkstra(const Graph &G, int src) {
    typedef pair<Weight, int> pwi;
    priority_queue<pwi, vector<pwi>, greater<pwi>> pq;
    pq.push(mp(0, src));
    int V = (int)G.size();
    vector<Weight> res(V, -1);
    while (pq.size()) {
        auto p = pq.top(); pq.pop();
        Weight d = p.first;
        int v = p.second;
        if (res[v] > -1)continue;
        res[v] = d;
        for (const auto &edge : G[v]) {
            int to = edge.to;
            Weight wei = edge.wei;
            pq.push(make_pair(d + wei, to));
        }
    }
    return res;
}

int N, M, L;

void solve() {
    cin >> N >> M >> L;
    --L;
    vi T(N);
    Graph G(N);
    int pos = 0;
    rep(i, N) {
        cin >> T[i];
        if (T[i] > 0)pos++;
    }
    if (pos <= 1) {
        cout << 0 << endl;
        return;
    }

    rep(i, M) {
        int a, b, c;
        cin >> a >> b >> c;
        --a; --b;
        G[a].emplace_back(a, b, c);
        G[b].emplace_back(b, a, c);
    }

    vll dl = dijkstra(G, L);
    
    
    ll ans = INFW;

    rep(i, N) {
        vll d = dijkstra(G, i);

        ll sm = 0, mi = INFW;
        rep(j, N) {
            sm += d[j] * 2 * T[j];
            if (T[j] > 0)smin(mi, dl[j] - d[j]);
        }
        sm += mi;
        smin(ans, sm);
    }
    cout << ans << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(15);
    solve();
    return 0;
}