#pragma GCC target("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")

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

using namespace std;
using namespace atcoder;
using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
ll MOD = 998244353;
ll MAX = 1e18;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll N,M,X;
    cin >> N >> M >> X;
    vector<ll> C(N);
    for(ll i = 0;i < N;i++){
        cin >> C[i];
        C[i]--;
    }
    vector<ll> A(M),B(M),Y(M);
    for(ll i = 0;i < M;i++){
        cin >> A[i] >> B[i] >> Y[i];
        A[i]--;B[i]--;
    }
    vector<ll> P(N,0);
    for(ll c = 0;c < 5;c++){
        vector<ll> X1(N),X2(N);
        for(ll i = 0;i < N;i++){
            if(C[i] == c) X1[i] = 1;
        }
        for(ll i = 0;i < M;i++){
            if(B[i] == c){
                X2[N - 1 - A[i]] += Y[i];
            }
        }
        vector<ll> X3 = convolution(X1,X2);
        for(ll i = 0;i < N;i++){
            P[i] += X3[N - 1 + i];
        }
    }
    ll ans = X * N;
    for(ll i = 0;i < N;i++){
        ans = max(ans,P[i] + X * i);
    }
    cout << ans << endl;
}