Mr. Duncan, the manager of Duncan's Toy Chest, donates a certain amount of money to children's funds each year around Christmas. The amount that goes to charity is always equal to the minimum number, which is divided by 2 and the number of toys sold in a year. Given the number of toys sold per year (
N), determine the amount that Mr. Duncan will donate.
Input
The input is a positive integer
N (1<=N<=10
9).
Imprint
Print a single number - the amount that Mr. Duncan will donate.
Examples
| # |
Input |
Output |
| 1 |
3 |
6 |
| 2 |
10 |
10 |
| 3 |
999999999 |
1999999998 |