import java.util.Scanner; 

class Main{

 public static void main(String[] args){

 Scanner scan = new Scanner(System.in);
   int FLG = 0;
   for (int N = scan.nextInt(); N > 0; N = N/10){
   if (N%10 == 7){
    FLG = 1;
     break;
   }
    }
  if (FLG == 0){  
  System.out.println("No");
  }
  
   else{
  System.out.println("Yes");
   }
 }
}
/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