#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++){
        int left=1,right=n,mid;
        while(left<right){
            mid=(left+right)/2;
            if(f[i]<=l[mid])right=mid;
            else left=mid+1;
        }
        mid=(left+right)/2;
        if(f[i]==l[mid])ans+=w[i];
        else{
            if(mid==n&&f[i]>l[mid])mid++;
            ll tmp=max(w[i]-(l[mid]-f[i]),w[i]-(f[i]-l[mid-1]));
            tmp=max(tmp,b[i]);
            ans+=tmp;
        }
    }
    cout<<ans<<endl;
    return 0;
}

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