import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static TreeSet<Long> ans = new TreeSet<>();
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        TreeSet<Integer> lakes = new TreeSet<>();
        for (int i = 0; i < n; i++) {
            lakes.add(sc.nextInt());
        }
        lakes.add(Integer.MIN_VALUE / 2);
        lakes.add(Integer.MAX_VALUE);
        long ans = 0;
        while (m-- > 0) {
            int x = sc.nextInt();
            int b = sc.nextInt();
            int w = sc.nextInt();
            ans += Math.max(b, w - Math.min(x - lakes.floor(x), lakes.ceiling(x) - x));
        }
        System.out.println(ans);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}