import java.util.Scanner;
public class Main{

    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.indexOf('7') == -1)
            System.out.print("No");
        else
            System.out.print("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