N,D,K=gets.split.map &:to_i
a=N.times.map{gets.to_i}
c=1
min=a[0]
v=0
b=[a[0]]
x=y=z=0
i,j=0,1
while j<a.size
  if j-i>D
    if a[i]==min
      c-=1
      if c==0
        b=a[i+1,D]
        min=b.min
        c=b.count(min)
        v=b.index(min)+i+1
      end
    end
    i+=1
  end
  if a[j]<min
    min=a[j]
    c=1
    v=j
  elsif a[j]==min
    c+=1
  elsif a[j]-min>z
    z=a[j]-min
    x=v
    y=j
  end
  j+=1
end
p z*K
puts "#{x} #{y}" if z>0