import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int X = sc.nextInt();

        String s = Integer.toString(X);

        if (String.valueOf(s).contains("7")) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }





    }
}