import java.util.*;
public class Main {// Main
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        long a = s.nextLong();
        boolean isExists = false;
        while(a > 0) {
            if(a%10 == 7) {
                isExists = true;
                break;
            }
            a = a/10;
        }
        if(isExists) {
            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