#include <iostream>
#include <vector>
using namespace std;
using lint = long long;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define REP(i, n) FOR(i,0,n)

#include <atcoder/convolution>

int main() {

    cin.tie(nullptr), ios::sync_with_stdio(false);
    int N, M, X;

    cin >> N >> M >> X;

    constexpr int C = 5;

    vector onset(C, vector<lint>(N + 1)), match(C, vector<lint>(N));
    REP(i, N) {
        int c;
        cin >> c;
        onset.at(c - 1).at(i) = 1;
    }

    while (M--) {
        int a, b, y;
        cin >> a >> b >> y;
        match.at(b - 1).at(N - a) += y;
    }

    REP(c, C) match.at(c) = atcoder::convolution_ll(match.at(c), onset.at(c));

    lint ret = 0;
    REP(i, N + 1) {
        lint tmp = i * lint(X);
        for (const auto &v : match) tmp += v.at(N - 1 + i);
        ret = max(ret, tmp);
    }
    cout << ret << endl;
}