import java.util.Scanner;

class Main {

	public static final String SEVEN = "7";
	public static void main(final String[] args) {

		Scanner scan = new Scanner(System.in);
		int inputN = scan.nextInt();
		scan.close();
		String numN = String.valueOf(inputN);
		String charN = null;
		for (int i=0; i < numN.length(); i++) {
			if (i != (numN.length() - 1)) {
				charN = numN.substring(i, i+1);
			} else {
				charN = numN.substring(i);
			}
			if (SEVEN.equals(charN)) {
				System.out.println("Yes");
				return;
			}
		} 
		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