import Control.Monad
import Data.List

main = do
 n <- readLn
 ss <- replicateM n getLine
 [m,x,d] <- map read . words <$> getLine
 print $ lcp n m x d ss

lcp n m x d ss = sum $ map lcp' (seed n m x d)
 where lcp' (i,j) = length $ takeWhile id $ zipWith (==) (ss!!(i-1)) (ss!!(j-1))

seed n m x d = reverse $ snd $ foldl makeq (x,[]) [1..m]
 where
  makeq (x', acc) k = ((x' + d) `mod` (n * (n - 1)), (i',j'):acc)
   where
    i = (x' `div` (n - 1)) + 1
    j = (x' `mod` (n - 1)) + 1
    [i',j'] = if i>j then [j,i] else [i,j+1]