Problem:
Score : 200 points

Problem Statement

Raccoon is fighting with a monster.

The health of the monster is H.

Raccoon can use N kinds of special moves. Using the i-th move decreases the monster's health by A_i.
There is no other way to decrease the monster's health.

Raccoon wins when the monster's health becomes 0 or below.

If Raccoon can win without using the same move twice or more, print Yes; otherwise, print No.

Constraints

1 \leq H \leq 10^9

1 \leq N \leq 10^5

1 \leq A_i \leq 10^4

All values in input are integers.

Input

Input is given from Standard Input in the following format:

H N
A_1 A_2 ... A_N

Output

If Raccoon can win without using the same move twice or more, print Yes; otherwise, print No.

Sample Input 1

10 3
4 5 6

Sample Output 1

Yes

The monster's health will become 0 or below after, for example, using the second and third moves.

Sample Input 2

20 3
4 5 6

Sample Output 2

No

Sample Input 3

210 5
31 41 59 26 53

Sample Output 3

Yes

Sample Input 4

211 5
31 41 59 26 53

Sample Output 4

No

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace abc153_b
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] str1 = Console.ReadLine().Split(' ');
            //モンスタークラスのコンストラクタに渡す
            monster mst = new monster(long.Parse(str1[0]));
            string[] str2 = Console.ReadLine().Split(' ');
            //int型の配列を作って、各スキルを入れる予定。
            int[] a = new int[int.Parse(str1[1])];
            for (int i = 0; i < int.Parse(str1[1]); ++i)
            {
                a[i] = int.Parse(str2[i]);
            }
            //アライグマのクラスを作成して、アライグマのスキル数と各スキルのダメージを渡す。
            raccoon arai = new raccoon(int.Parse(str1[1]),a);

            fight match = new fight();
            if (match.winLose(mst, arai))
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }
        }
    }
    class fight
    {
        public Boolean winLose(monster a,raccoon b)
        {
            long allDamage = 0;
            for(int i = 0; i < b.skill; ++i)
            {
                allDamage += b.skillNo[i];
            }
            
            return allDamage >= a.hp ? true : false;
        }
    }
    /// <summary>
    /// モンスタークラス
    /// </summary>
    class monster
    {
        public long hp;
        public monster(long h)
        {
            this.hp = h;
        }
    }
    /// <summary>
    /// アライグマクラス
    /// </summary>
    class raccoon
    {
        public int skill;
        public int[] skillNo;
        public raccoon(int s, int[] sn)
        {
            this.skill = s;
            this.skillNo = sn;
        }
    }
}