You have N cards. On the i-th card, an integer A_i is written.

For each j = 1, 2, ..., M in this order, you will perform the following operation once:

Operation: Choose at most B_j cards (possibly zero). Replace the integer written on each chosen card with C_j.

Find the maximum possible sum of the integers written on the N cards after the M operations.

Constraints

* All values in input are integers.
* 1 \leq N \leq 10^5
* 1 \leq M \leq 10^5
* 1 \leq A_i, C_i \leq 10^9
* 1 \leq B_i \leq N

Input

Input is given from Standard Input in the following format:


N M
A_1 A_2 ... A_N
B_1 C_1
B_2 C_2
\vdots
B_M C_M


Output

Print the maximum possible sum of the integers written on the N cards after the M operations.

Examples

Input

3 2
5 1 4
2 3
1 5


Output

14


Input

10 3
1 8 5 7 100 4 52 33 13 5
3 10
4 30
1 4


Output

338


Input

3 2
100 100 100
3 99
3 99


Output

300


Input

11 3
1 1 1 1 1 1 1 1 1 1 1
3 1000000000
4 1000000000
3 1000000000


Output

10000000001
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);

    int N = scanner.nextInt();
    int M = scanner.nextInt();

    List<Card> list = new ArrayList<>();
    for (int i = 0; i < N; i++) {
      int a = scanner.nextInt();
      list.add(new Card(a, 1));
    }
    for (int i = 0; i < M; i++) {
      int a = scanner.nextInt();
      int b = scanner.nextInt();
      list.add(new Card(b, a));
    }
    list.sort((c1, c2) -> c2.number - c1.number);

    int remain = N;
    long sum = 0;
    for (Card c : list) {
      int r = Math.min(remain, c.count);
      sum += (long) c.number * r;
      remain -= r;
    }
    System.out.println(sum);
  }

  private static class Card {
    private final int number;
    private final int count;

    private Card(int number, int count) {
      this.number = number;
      this.count = count;
    }
  }
}
