import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String[] n = new String[3];
		int cnt = 0;
		n = sc.next().split(""); String msg = "";
		for(int i = 0; i < n.length; i++) {
			if (n[i].equals("7")) cnt++;
		}
		System.out.println(cnt > 0 ? msg = "Yes" : "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