package main

import (
	"fmt"
)

func main() {
	var N, rlt int
	var s string
	fmt.Scan(&N)
	m := make(map[string]int)
	for i := 0; i < N; i++ {
		fmt.Scan(&s)
		m[s]++
	}
	for _, v := range m {
		if v == 1 {
			rlt++
		}
	}
	fmt.Println(rlt)
}