import java.util.*;

public class Main {

    public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String n = sc.nextLine();
            boolean check =false;
      		
      		for(int i=0;i<3;i++)
      		if(n.charAt(i)=='7')check=true;

            System.out.println(check?"Yes":"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