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

public class Main {
    public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
        String str = s.next();
      	
      	if (str.contains("7")) 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