import java.util.*; 
 
class Main{
public static void main(String[] args){
	Scanner sc=new Scanner(System.in);
       String s=sc.next();
String[] a=s.split("");
 
 
 	if(a[0].equals("7")||a[1].equals("7")||a[2].equals("7")){
    		System.out.println("Yes");
    	}else{
     		System.out.println("No");
   	 }
 
    	System.out.println();
    }
}
/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