import java.util.Scanner;
public class Main{
  public static void main(String args[]){
 Scanner enter = new Scanner(System.in);
  int n = enter.nextInt();
  String s = String.valueOf(n);
  
  if(s.contains("7")){
    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