/*
 * Copyright (C) 2017 Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net> All rights reserved.
 * Author: Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source
 *    distribution.
 */

#include <stdio.h>

int main(void) {
	unsigned int n = 1;
	while(1) {
		printf("2^%u=", n);
		unsigned int a;
		scanf("%u", &a);
		if(a == 0) {
			printf("Goodbye!\n");
			return 0;
		} else if(a != 2 << (n - 1)) {
			printf("Wrong answer, try again.\n");
		} else {
			printf("Correct!\n");
			++n;
		}
	}
}