from collections import deque

N, D, K = map( int, input().split() )
X = list( int( input() ) for i in range( N ) )

window = [ -1 for i in range( N ) ]
dq = deque()
for i in range( N ):
  while len( dq ) and i - dq[ 0 ] > D:
    dq.popleft()
  if len( dq ):
    window[ i ] = dq[ 0 ]
  while len( dq ) and X[ i ] < X[ dq[ len( dq ) - 1 ] ]:
    dq.pop()
  dq.append( i )

best = 0
bl, br = -1, -1
for i in range( N ):
  if window[ i ] == -1: continue
  if [ best, bl ] >= [ X[ i ] - X[ window[ i ] ], - window[ i ] ]: continue
  best = X[ i ] - X[ window[ i ] ]
  bl, br = - window[ i ], i

print( best * K )
if best > 0:
  print( - bl, br )