#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m, x;
  cin >> n >> m >> x;
  vector<mint> c[5];
  rep(i, 5) c[i].resize(n);
  rep(i, n) {
    int ci;
    cin >> ci;
    c[ci - 1][i] = 1;
  }
  rep(i, 5) reverse(all(c[i]));
  vector<mint> f[5];
  rep(i, 5) f[i].resize(n);
  rep(i, m) {
    int a, b, y;
    cin >> a >> b >> y;
    f[b - 1][a - 1] += y;
  }
  rep(i, 5) f[i] = convolution(f[i], c[i]);
  ll ans = (ll)x * n;
  rep(i, n) {
    ll v = 0;
    rep(j, 5) v += f[j][i].val();
    v += ll(n - 1 - i) * x;
    chmax(ans, v);
  }
  cout << ans << '\n';
}