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

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n,m;
  cin>>n>>m;
  vector<long long> l(n),f(m),b(m),w(m);
  for (int i=0;i<n;i++) cin>>l[i];
  for (int i=0;i<m;i++) cin>>f[i]>>b[i]>>w[i];
  sort(l.begin(),l.end());
  long long ans=0;
  for (int i=0;i<m;i++) {
    int idx=lower_bound(l.begin(),l.end(),f[i])-l.begin();
    if (idx==n) idx--;
    if (l[idx]==f[i]) {
      ans+=w[i];
      continue;
    }
    long long get=w[i]-abs(l[idx]-f[i]);
    if (get>=b[i]) {
      ans+=get;
      continue;
    }
    if (idx>0) {
      idx--;
      long long get2=w[i]-abs(f[i]-l[idx]);
      if (get2>=b[i]) {
        ans+=get2;
        continue;
      }
    }
    ans+=b[i];
  }
  cout<<ans<<endl;
}