PROGRAMMING:Judge even numbers

Input a positive integer a, if a is even, output yes, otherwise output No.
###Input format:
Enter a positive integer directly without any additional characters.
###Output format:
Output yes or no directly without any additional characters.
###Input example:
```in
two
```
###Output example:
```out
yes
```
###Input example:
```
one
```
###Output example:
```
no
```






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