n,d,k,*x=$<.read.split.map &:to_i
y=(0...n-d).map{|i|l=x[i+1,d];m=l.max;[m-x[i],-i,-l.index(m)-i-1]}.max
if y[0]<1
 p 0
else
 p y[0]*k
 print -y[1],' ',-y[2]
end