#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using namespace atcoder;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m; cin >> n >> m;
    long long x; cin >> x;
    vector<int> c(n);
    for(int i = 0; i < n; i++){
        cin >> c[i]; c[i]--;
    }
    vector<int> a(m), b(m);
    vector<long long> y(m);
    for(int i = 0; i < m; i++){
        cin >> a[i] >> b[i] >> y[i];
        a[i]--, b[i]--;
    }
    vector<long long> res(n + 1);
    for(long long i = 0; i <= n; i++){
        res[i] = x * i;
    }
    vector<vector<long long>> q(5, vector<long long>(n));
    for(int i = 0; i < m; i++){
        q[b[i]][a[i]] += y[i];
    }
    for(int i = 0; i < 5; i++){
        vector<long long> p(n);
        for(int j = 0; j < n; j++){
            if(c[j] == i){
                p[j] += 1;
            }
        }
        reverse(q[i].begin(), q[i].end());
        vector<long long> r = convolution_ll(p, q[i]);
        for(int j = n - 1; j < 2 * n - 1; j++){
            res[j - n + 1] += r[j];
        }
    }
    long long ans = *max_element(res.begin(), res.end());
    cout << ans << endl;
}