import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sn = new Scanner(System.in);
        
        int n = sn.nextInt();
        List<String> s = new ArrayList<>();
        int cnt = 0;
		Set<String> checkHash = new HashSet<String>();
        
        while (sn.hasNext()) {
            s.add(sn.nextLine());
        }
        
        for(String str : s) {
            if(checkHash.contains(str)) {
				// 重複があればtrueをセットし終了
				cnt++;
			} else {
				// 重複しなければハッシュセットへ追加
				checkHash.add(str);
			}
        }
        System.out.print(n - cnt);
    }
}

/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