import java.util.*;
import java.lang.Math;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      	
      	String n = sc.next();
      	boolean con = true;
      
      	for(int i = 0;i < n.length() && con;i++){
          if(n.charAt(i) == '7') con = false;
        }
      
      	if(con) 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