
import java.io.*;
import java.util.*;

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

		if(flag){
			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