#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
	int A, B, C, t=1, n=0;
	while (t==1)
	{
	cout << "請使用者輸入A:	\n";
	cin  >> A;
	cout << "請使用者輸入B:	\n";
	cin  >> B;
	cout << "請使用者輸入C:	\n";
	cin  >> C;
	if (A<=30 && B<=500)
	{
		cout << "公式2*A*A*A - B*B - 5*C ( A = " << A 
			<<", B = " << B << ", C = " << C << " ) 答案為";
		if  ((2*A*A*A - B*B - 5*C)>0)
			cout << "正 " << (2*A*A*A - B*B - 5*C) << "\n";
		else if ((2*A*A*A - B*B - 5*C)<0)
			cout << "負 " << -(2*A*A*A - B*B - 5*C) << "\n";
		else
			cout << "零 \n";
		n++;
	}
	else
		t=0;
	}
	cout << "條件不符合停止計算。\n";
	cout << "你共計算了"<< n <<"次。\n"; 
  return 0;
}