Every winter break, Mackenzie students go on a trip to the Lyon ski resort. Ms. William and her students are all suited up and ready to get onto the ski lift. All chairs hold two people with a certain maximum weight. Help Ms. William determine the minimum number of chairs she needs in order to send up the maximum number of students.

#### Input Specification

The first line will contain an integer that indicates the maximum weight capacity, , a chair can hold.

The second line will contain an integer, , that indicates how many individuals need to be brought up the chairlift.

The next lines contain integers that represent the weight, , of each individual.

#### Output Specification

Output the minimum number of chairs needed to send up the maximum number of
students. Then, on the next line, output `YES`

if there is any student(s) too heavy to
be brought up by the ski lift and `NO`

if all students are able to be brought up the
mountain.

#### Sample Input 1

```
18
6
1
9
18
16
12
5
```

#### Sample Output 1

```
4
NO
```

#### Sample Input 2

```
34
3
30
38
1
```

#### Sample Output 2

```
1
YES
```

## Comments