#include <ctime>
#include <iostream>
using namespace std;
int main() {
	srand((unsigned)time(NULL));
	int c = 2;
	while(clock() < 1.4 * CLOCKS_PER_SEC) c = 2 * c % 1000000007;
	if(rand() % 3 == 0) cout << ":(" << endl;
	else cout << "Yes" << endl;
	return 0;
}