import java.util.Scanner;
//import java.util.Random;

class Main{
	public static void main(String[] args){
		Scanner stdIn=new Scanner(System.in);
		
		String s=stdIn.next();
		
		int idx=s.indexOf("7");
		if(idx==-1) System.out.println("No");
		else System.out.println("Yes");
	}
}
/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