import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        Map<String,Integer> map = new HashMap<>();
        int ans = 0;
        for(int i = 0;i < n;i++){
            String s = sc.next();
            map.put(s,1);
        }

        Iterator ite = map.values().iterator();
        while(ite.hasNext()){
            ans += (Integer)ite.next();
        }
        System.out.println(ans);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz