import strutils


proc nextString: string =
   result = ""
   while not endOfFile stdin:
      let nextChar = readChar stdin
      case nextChar
      of '\r':
         discard
      of "\n"[0], ' ':
         break
      else:
         add result, nextChar


proc nextInt: int =
   return parseInt nextString()


proc main: void =
   let D = nextInt()

   var j = 0
   for i in 1..int.high:
      let ss = $i
      for s in ss:
         j += 1
         if j == D:
            s.echo
            return


when isMainModule:
   main()