n,d,K,*x=$<.read.split.map &:to_i
m=[0,0,0]
c=h=$$*$$
n.times{|j|f=[j+d,n-1].min
a=x[j]
a>=c&&x[f]<=x[h]&&next
(j+1..f).map{|k|v=x[k]-a;v<0&&break;v>m[0]&&m=[v,j,k]}
c,h=a,f}
puts m[0]<1?0:[m[0]*K,m[1,2]*' ']