PROGRAMMING:Fat house water
As is known to all, a bottle of fat house water costs 3 yuan, but today XX Bao has a discount, so a bottle only costs 2.5 yuan. If you have n yuan, how many bottles of fat house water can you buy
###Input format:
Enter a number n
###Output format:
Output a positive integer to show how many bottles you can buy
###Input example:
```in
ten
```
###Output example:
```out
four
```
answer：If there is no answer, please comment
###Input format:
Enter a number n
###Output format:
Output a positive integer to show how many bottles you can buy
###Input example:
```in
ten
```
###Output example:
```out
four
```
answer：If there is no answer, please comment