import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner tan = new Scanner(System.in);
        int n,a=0,p=0;
        n = tan.nextInt();
        while(n!=0){
            a=n%10;
            n=n/10;
            if(a==7){
                p++;
                break;
            }
        }
        if(p==0)
            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