import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.Set;

public class Main {
	public static void main(String[] args) throws Exception {
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			int n = Integer.parseInt(br.readLine());
			Set<String> set = new HashSet<String>();
			for (int i = 0; i < n; i++) {
				set.add(br.readLine());
			}
			System.out.println(set.size());
		}
	}
}
/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