import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        if(n / 100 == 7){
            System.out.println("Yes");
        }else if(n % 100 / 10 == 7){
            System.out.println("Yes");
        }else if(n % 10  == 7){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
}
