#include <bits/stdc++.h>
using namespace std;
#include <atcoder/convolution>
using namespace atcoder;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll n,m,x;
    cin >> n >> m >> x;
    vector<vector<ll>> c(5,vector<ll>(n,0)), b(5,vector<ll>(n,0));
    rep(i,n){
        int a;
        cin >> a;
        c[a-1][n-i-1] = 1;
    }
    rep(i,m){
        int p,q,r;
        cin >> p >> q >> r;
        p--; q--;
        b[q][p] += r;
    }
    vector<vector<ll>> d(5);
    rep(i,5){
        d[i] = convolution_ll(c[i],b[i]);
    }
    ll ans = n*x;
    rep(i,n){
        ll upd = x*(n-i-1);
        rep(j,5) upd += d[j][i];
        chmax(ans, upd);
    }
    cout << ans << '\n';
    return 0;
}