import strscans

let
  (_, a, b, c) = stdin.readAll.scanTuple"$i $i $i"

if c mod a == 0:
  echo c div a
  if (b + c) mod a == 0:
    echo (b + c) div a
  quit()

if (b + c) mod a == 0:
  echo (b + c) div a
  quit()

echo -1