import java.util.*;

public class Main {
    public static void main(String[] args)
    {
        Scanner scan1 = new Scanner(System.in);
        int num = scan1.nextInt();
        String res = "No";

        for (int i = 0; i < 3; i++)
        {
            if ((num/(int)Math.pow(10, i)) % 10 == 7) {
               res = "Yes";
                break;
            }
        }
        System.out.println(res);

    }
}

/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