n,b=gets.split.map &:to_i
a=(0...n).map{gets.split.map &:to_i}
x=a.map{|c|c[0]}.sort.uniq
a.map{|c|c[0]=x.index(c[0])}
p a

z=0
n.times{|i|n.times{|j|
  f=[0]*n
  g=[0]*n
  n.times{|k|a[i][1]<=a[k][1]&&a[k][1]<=a[j][1]&&(f[a[k][0]]+=1;g[a[k][0]]+=a[k][2])}
  s=t=0
  l=0
  n.times{|k|
    s+=f[k]
    t+=g[k]
    while t>b do s-=f[l];t-=g[l];l+=1 end
    z<s&&z=s
  }
}}
p z