import java.util.*;

public class Main {
  public static void main(String[] args){

    Scanner sc = new Scanner(System.in);
    
    String ans = "No";
    int a = sc.nextInt();
    
    String as = String.valueOf(a);
    String x = as.substring(0, 1);
    String y = as.substring(1, 2);
    String z = as.substring(2, 3);
 
    if ("7".equals(x) || "7".equals(y) || "7".equals(z)) {
      ans = "Yes";
    }
 
    System.out.println(ans);
  }
}
/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