n,c=gets.split.map &:to_i
l=gets.split.map &:to_i
w=gets.split.map &:to_i
d=Array.new(151){Array.new(51){[0]*51}}
(0...n).each{|i|
  (0...n).each{|j|
    (0...n).each{|k|
      (x=l[i])!=(z=l[k])&&(x<(y=l[j])&&y>z||x>y&&y<z)?(d[w[i]+w[j]+w[k]][y][z]=x+y+z):0
    }
  }
}
(0..c).each{|a|
  (0..50).each{|x|
    (0..50).each{|y|
      (0...n).each{|i|
        d[b=a+w[i]][y][z=l[i]]=[d[b][y][z],(e=d[a][x][y])>0&&x!=z&&(x<y&&y>z||x>y&&y<z)?e+z:0].max
      }
    }
  }
}
p d[0,c+1].map{|f|f.map(&:max).max}.max