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

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String regex = "7";
    Pattern p = Pattern.compile(regex);

    check(p, s);
  }

  private static void check(Pattern pattern, String target){
    Matcher matcher = pattern.matcher(target);
    if (matcher.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