import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        boolean ans = false;
        String[] strArray = new String [3];
        for(int i=0;i<3;i++) {
            strArray[i] = String.valueOf(str.charAt(i));
        }
        for(int i=0;i<3;i++) {
            if(strArray[i].equals("7")) {
                ans = true;
            }
        }
        if(ans == true) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
        sc.close();
    }
}

/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