import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int N = scan.nextInt();
		int f = 0;

		if (N % 10 == 7) {
			f++;
		}
		N /= 10;

		if (N % 10 == 7) {
			f++;
		}
		N /= 10;

		if (N == 7) {
			f++;
		}

		if (f == 0) {
			System.out.println("No");
		} else {
			System.out.println("Yes");
		}
	}

}
/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