import java.util.*;

class Main {
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
        String judge = "No";
        for (int i = 0; i < 3; i++) {
            if (N.charAt(i) == '7') {
                judge = "Yes";
                break;
            }
        }
        System.out.println(judge);

    }
}
/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