n,d,k,*x=$<.read.split.map &:to_i
n,d,k,*x=s.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]
    m=[v,j,k] if v>m[0]
  }
}
if m[0]<1
 p 0
else
 p m[0]*k
 puts m[1,2]*' '
end