import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int number = sc.nextInt();
		sc.close();

		String str = String.valueOf(number);
		String result = "No";
		for(char ch : str.toCharArray()) {
			if ('7' == ch) {
				result = "Yes";
				break;
			}
		}

		System.out.print(result);
	}

}

/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