n,d,K,*x=$<.read.split.map &:to_i
m=[0,0,0]
(0..n-=1).each{|j|
  (j+1..[j+d,n].min).each{|k|
    v=x[k]-x[j] rescue binding.mirb
    m=[v,j,k] if v>m[0]
  }
}
m[0]<1?p(0):puts(m[0]*K,m[1,2]*' ')