import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
	    boolean found = false;
		Scanner input = new Scanner(System.in);
		String s = input.next();
		for(int i=0;i<s.length();i++){
		    if(s.charAt(i)=='7'){
		        System.out.println("Yes");
		        found = true;
		    }
		    if(found){
		        break;
		    }
		}
		if(!found){
		    System.out.println("No");
		}
	}
}

/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