#!/usr/bin/ruby
def value(a)
	idxes={}
	a.each_with_index{|e,i|idxes[e]=i}
	ret=0
	1.upto(N-1){|i|
		idxi=idxes[i]
		(i+1).upto(N){|j|
			idxj=idxes[j]
			r=0
			(0..N-1).each{|idxk|
				next if idxk==idxi || idxk==idxj
				b=[[idxi,a[idxi]],[idxj,a[idxj]],[idxk,a[idxk]]].sort
				if (b[0][1]<b[1][1]&&b[2][1]<b[1][1]) || (b[0][1]>b[1][1]&&b[2][1]>b[1][1])
					r=[r,a[idxk]].max
				end
			}
			ret+=[r,i,j].max if r>0
		}
	}
	ret
end
N,M=gets.split.map(&:to_i)
p M.times.max_by{|i|value(gets.split.map(&:to_i))}