PROGRAMMING:Finding prime numbers
This topic requires the input of a positive integer greater than or equal to 2, find all prime numbers not greater than the positive integer.
###Input format:
Enter a positive integer no less than 2.
###Output format:
For the input positive integer, the output is not greater than the prime of the positive integer.
###Input example:
```in
thirty
```
###Output example:
```out
2 3 5 7 11 13 17 19 23 29
```
answer：If there is no answer, please comment
###Input format:
Enter a positive integer no less than 2.
###Output format:
For the input positive integer, the output is not greater than the prime of the positive integer.
###Input example:
```in
thirty
```
###Output example:
```out
2 3 5 7 11 13 17 19 23 29
```
answer：If there is no answer, please comment