import java.util.*;

public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String string[] = {"Yes", "No"};
		int ans = 1;
		while(n > 0){
			int tmp = n / 10;
			int digitnum = n - tmp * 10;
			if(digitnum == 7)ans = 0;
			n /= 10;
		}
		sc.close();
		System.out.println(string[ans]);
	}
}
