
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
	// write your code here
        Scanner scanner = new Scanner(System.in);
            int b = scanner.nextInt();
            Boolean ans = false;
            while(b > 0){
                int c = b % 10;
                if(c == 7)
                {
                    System.out.println("Yes");
                    ans = true;
                    break;
                }
                b /= 10;

            }
            if(ans == 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