/* 2. ´ÙÀ½ ÇÁ·Î±×·¥ÀÇ Ãâ·ÂÀ» ½á¶ó. */


#include <stdio.h>
#include <string.h>

int number[5] = { 1, 2, 3, 4, 5 };

class Stack {
	int s[10];
	int top;
public:
	Stack() {
		top = -1;
	}
	void operator+(int x) {
		int y = all();
		top++;
		s[top] = x + y;
	}
	void operator-(int x) {
		for (int i = 0; i < x; i++) top--;
	}
	int all() {
		int y = 0;
		for(int i = 0; i <= top; i++) y = y + s[i];
		return y;
	}
	void print() {
		printf("answer = %d\n",s[top]);
	}
};

void main()
{
	Stack aStack;

	aStack + number[0];
	aStack + number[1];
	aStack + number[2];
	aStack - 2;
	aStack + number[3];
	aStack + number[4];
	aStack - 1;
	aStack.print();
}