#include<bits/stdc++.h>
using namespace std;
int n,p,x,y,z,a[5000005],minn=300;
int main(){
	cin>>n>>p;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=p;i++){
		cin>>x>>y>>z;
		for(int j=x;j<=y;j++){
			a[j]+=z;
		}
	}
	for(int i=1;i<=n;i++){
		minn=min(minn,a[i]);
	}
	cout<<minn;
}