#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;

void IO(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
}

int main(){
  IO();
  ll n,m;
  cin>>n>>m;
  vector<ll> l(n+2);
  l[0]=-1e18;
  for(ll i=1;i<=n;i++){
    cin>>l[i];
  }
  l[n+1]=1e18;
  vector<ll> f(m),b(m),w(m);
  for(ll i=0;i<m;i++){
    cin>>f[i]>>b[i]>>w[i];
  }
  ll ans=0;
  for(ll i=0;i<m;i++){
    auto itr=lower_bound(l.begin(),l.end(),f[i]);
    ll vl=*itr;
    ll vr=*prev(itr);
    ll tmp=min(abs(vl-f[i]),abs(vr-f[i]));
    if(b[i]<w[i]-tmp){
      ans+=w[i]-tmp;
    }else{
      ans+=b[i];
    }
  }
  cout<<ans<<endl;
}