import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.HashSet;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		
		InputStreamReader reader = new InputStreamReader(System.in, StandardCharsets.UTF_8);
		
		try(BufferedReader br = new BufferedReader(reader)) {
			int n = Integer.parseInt(br.readLine());
			Set<String> input = new HashSet<>();
			for(int i = 0; i < n; i++) {
				input.add(br.readLine());
			}
			System.out.println(input.size());
		} catch (IOException e) {
			e.printStackTrace();
		} 

	}

}
/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