import java.io.*;

public class Main
{
	public static void main(String[] args) throws IOException
	{
		BufferedReader br=
		new BufferedReader(new InputStreamReader(System.in));
		
		String str = br.readLine();
		int num = str.indexOf('7');
		if(num <0){
			System.out.println("No");
		}else{
			System.out.println("Yes");
		}
	}
}
/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