import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Boolean flag = false;
        Scanner scan = new Scanner(System.in);
        String N = scan.nextLine();
        char[] Narray = N.toCharArray();
        for(char ln :Narray){
            if(ln == '7'){
                System.out.println("Yes");
                flag = true;
                break;
            }
        }
        if(flag == false)
            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