#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
    int n, m;
    cin >>n >>m;
    int shade[n];
    int FishP[m];
    int Nshade[m];
    int Yshade[m];
    int Dist[m];
    int tot=0;
    int move=0;
    for(int i=0; i<n;i++){
        cin >> shade[i];
    }
    for(int i=0; i<m;i++){
        cin >> FishP[i] >> Nshade[i] >> Yshade[i];
    }
    for(int i=0; i<m; i++){
        Dist[i] =1e9+1;
        for(int j=0;j<n;j++){
            if (Dist[i]>abs(shade[j]-FishP[i])){
                Dist[i]=abs(shade[j]-FishP[i]);
            }
            else if(abs(shade[j]-FishP[i])==0){
                Dist[i]=abs(shade[j]-FishP[i]);
                break;
            }
            else{
                break;  
            }
            
        }
        if(Dist[i]<(Yshade[i]-Nshade[i])){
            move+=Dist[i];
            tot+=Yshade[i];
        }
        else{
            tot+=Nshade[i];
        }
    }
    cout << tot-move;
    return 0;
}