		import java.util.*;
		 import java.util.stream.Collectors;
		 import java.util.function.Function;
public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
				       Scanner sc= new Scanner(System.in);
		        char[] n = sc.nextLine().toCharArray();
		        for(int i=0;i<3;i++){
		            if(n[i]=='7'){
		                System.out.println("Yes");
		                return;
		            }
		            
		        }
		        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