#include <stdio.h>

void print_menu()
{
	printf("1. 햄버거\n");
	printf("2. 치즈버거\n");
	printf("3. 샌드위치\n");
	printf("4. 종료\n");
}
int check_menu_number()
{
	int input;
	scanf("%d", &input);
	if (input == 1)
		return 1;
	else if (input == 2)
		return 2;
	else if (input == 3)
		return 3;
	else if (input == 4)
		return 4;
	else
		return 0;
	return input;
}

int main(void)
{
	int x;
	print_menu();
	x = check_menu_number();
	if (x == 0)
	{
		while (x != 0)
		{
			print_menu();
			x = check_menu_number();
		}
	}
	else if (x != 0)
		printf("%d번이 선택되었습니다\n", x);

	return 0;
}