import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		String s = scn.next();
		boolean check = false;
		for (int i = 0; i < s.length(); i++) {
			char ch = s.charAt(i);
			if (ch == '7') {
				check = true;
				break;
			}
		}

		if (check) {
			System.out.println("Yes");
		} else {
			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