import java.util.Scanner;
public class Main
{
    public static void main(String[]args)
    {
        Scanner ra = new Scanner(System.in);
        String s = ra.next();
        String[] arreglo = s.split("");
        int []arregloenteros = new int [arreglo.length];
        for(int i=0;i<arreglo.length;i++)
        {
            arregloenteros[i] = Integer.parseInt(arreglo[i]);
        }
        boolean estaelsiete=false;
        for(int i=0;i<arreglo.length;i++)
        {
            estaelsiete= arregloenteros[i]==7;
            if(estaelsiete==true)
            {
                System.out.println("Yes");
                break;
            }
        }
        if(estaelsiete==false)
        System.out.print("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