import java.util.*;

public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String string[] = {"Yes", "No"};
		int ans = 1;
		while(n > 0){
			int tmp = n / 10;
			int digitnum = n - tmp * 10;
			if(digitnum == 7)ans = 0;
			n /= 10;
		}
		sc.close();
		System.out.println(string[ans]);
	}
}

/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