#include<bits/stdc++.h>
#include <vector>
using namespace std;
#define ll long long
#define ld long double
const ll M = 1e9+7;

int main() {
    ll n,m,ans=0,r=0;cin >> m >> n;vector <ll> arr(m);
    for (ll i = 0; i < m; i++)cin >> arr[i];
    while(n--){
        ll cor,a,b;cin >> cor >> a >> b;
        ll it=lower_bound(arr.begin(),arr.end(),cor)-arr.begin();
        if(arr[it]==cor)ans+=b;
        else if(it==0){
            if(arr[it]-cor<b-a){r+=arr[it]-cor;ans+=b;}
            else ans+=a;
        }else if(it==n){
            if(cor-arr[it-1]<b-a){r+=cor-arr[it-1];ans+=b;}
            else ans+=a;
        }else{
            if(arr[it]-cor<b-a){r+=arr[it]-cor;ans+=b;}
            else if(cor-arr[it-1]<b-a){r+=cor-arr[it-1];ans+=b;}
            else ans+=a;
        }
    }cout << ans-r;
}