import java.util.Scanner;
 
public class Main { //クラス名はMain
    public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
      int N = in.nextInt();
      int hundreds = N / 100;
      int tens = (N / 10) % 10; // (n % 100) / 10
      int ones = N % 10;
       if ((hundreds == 7) || (tens == 7) || (ones == 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