import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;

public class Main {
  
  public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    String inputStr = sc.nextLine();
    
    String regex = "[7]";
    Pattern p = Pattern.compile(regex);
    Matcher m = p.matcher(inputStr);

    if (m.find()) {
      System.out.println("Yes");
    } else {
      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