[백준] - 25304 - 영수증

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

       Scanner sc = new Scanner(System.in);

       //합계 금액
       int X = sc.nextInt();

       //물건 갯수
       int N = sc.nextInt();

       //물건 가격
       int price = 0;
       int quantity = 0;

       int total = 0;

       //물건 갯수 만큼 반복
       while(N>0){
           price = sc.nextInt();
           quantity = sc.nextInt();
           total += price * quantity;
           N--;
       }
       if(X == total){
           System.out.println("Yes");
       }else{
           System.out.println("No");
       }
    }
}