new sort.java

import java.util.*;
import java.io.IOException;
public class Main {
    public static void main (String[] args) throws IOException
    {
Scanner in = new Scanner(System.in);
        long sila = in.nextLong();
        int n = in.nextInt();
        String finish = "YES";
        int[][] array = new int[n][2];
        for (int i = 0; i <n; i++) {
            array[i][0] = in.nextInt();
            array[i][1] = in.nextInt();
        }
        for(int i =n-1 ; i > 0 ; i--){
            for(int j = 0 ; j < i ; j++){
                if( array[j][0] > array[j+1][0] ){
                    int tmp = array[j][0];
                    array[j][0] = array[j+1][0];
                    array[j+1][0] = tmp;
                    int tmx = array[j][1];
                    array[j][1] = array[j+1][1];
                    array[j+1][1] = tmx;
                }}}
        for (int i = 0; i <n; i++) {
          if(array[i][0]>=sila)finish="NO";
          sila+=array[i][1];
        }
        System.out.println(finish);
    }
}