A chip was placed in each extreme cell of the square board. Could it turn out that exactly k chips are placed? (For example, if the board is 22, then 4 chips are exposed, and if 66, then 20).
Input
One natural number k is entered, not exceeding 30000
Imprint
The program should print the word YES if there is such a size of the board that exactly (no more and no less) k chips will be put on, otherwise it should print the word NO.
Examples
| # |
Input |
Output |
| 1 |
20 |
YES |
| 2 |
13 |
NO |