function Main(input) {
  tmp = input.split("\n")
  i = parseInt(tmp[0], 10)
  tmp.shift()
  trim = []
  tmp.map(v => {
  	if(!trim.includes(v)){
      trim.push(v)
    }
    return trim
  })
  console.log(trim.length)
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"))