#include <bits/stdc++.h>
#define ll long long
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    ll n,m;
    cin>>n>>m;
    ll l[n+5],f[m+5],b[m+5],w[m+5];
    l[0]=-1000000005;
    l[n+1]=1000000005;
    for(ll i=1;i<=n;i++)cin>>l[i];
    for(ll i=1;i<=m;i++)cin>>f[i]>>b[i]>>w[i];
    ll ans=0;
    for(ll i=1;i<=m;i++){
        ll left=1,right=n,mid=(left+right)/2,mn=abs(l[mid]-f[i]);
        while(left<right){
            mid=(left+right)/2;
            if(f[i]<=l[mid])right=mid;
            else left=mid+1;
            mn=min(mn,abs(l[mid]-f[i]));
            mn=min(mn,abs(l[left]-f[i]));
            mn=min(mn,abs(l[right]-f[i]));
        }
        mid=(left+right)/2;
        if(f[i]==l[mid])ans+=w[i];
        else ans+=max(b[i],w[i]-mn);
    }
    cout<<ans<<endl;
    return 0;
}