import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		String  str = scan.next();
		boolean flag = false;

		if(str.charAt(0)=='7')flag=true;
		if(str.charAt(1)=='7')flag=true;
		if(str.charAt(2)=='7')flag=true;

		System.out.println((flag)?"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