import java.util.*;

class Main {
    public static void main(final String[] args) {

        final Scanner sc = new Scanner(System.in);
        int i = sc.nextInt();

        boolean flg = false;
        while (i != 0) {
            if (i % 10 == 7) {
                flg = true;
            }
            i /= 10;
        }
        if (flg) {
            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