Grisha N. told his two teammates that he was going to solve all given
problems at the subregional contest, even if the teammates wouldn’t show up
at the competition. The teammates didn’t believe Grisha so he told them
the plan how he was going to do this.
During the first hour he wants to solve f problems. If there is still
some time left to the end of the first hour, Grisha will simply walk
along the hall. Beginning from the second hour Grisha wants to spend
exactly 45 minutes on each of the problems left. If the plan is a success,
will Grisha be able to solve all 12 given problems for 5 hours?
The only line contains an integer f that is the number of problems
Grisha wants to solve during the first hour of the competition (1 ≤ f ≤ 11).
Output “YES”, if Grisha manages to solve all the given problems
alone, and “NO” if he doesn’t.
Problem Author: Alexander Ipatov (prepared by Olga Soboleva)
Problem Source: NEERC 2014, Eastern subregional contest