Further information: https://codeforces.com/blog/entry/138804?#comment-1242632
QOJ.ac
QOJ
			Time Limit:
			2 s		
				Memory Limit:
			512 MB		
				Total points:
			120		
									
#11437. Cipele
Statistics
			The problem was used in the following contests:
					
		
		This is a wrong problem. The intended solution is wrong or the statement is confusing. The problem is reserved
			here for reference only. We do not recommend you to try to solve the problem.