import java.util.Scanner;

public class Main
{
    public static void main(String [] args)
    {
        Scanner key = new Scanner(System.in);
        String s = key.nextLine();
        boolean flag = false;
        for(int i = 0; i<s.length(); i++)
        {
            
            if(s.charAt(i)== '7')
                flag = true;
        }
        if(flag == true)
        {
            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