#include <stdio.h>
 
#define SIZE 10
double stack[SIZE];
int sp;
 
void push(double value);
double pop(void);
int isFull(void);
int isEmpty(void);
void answer(void);
void reset(void);
 
int main(void) {
 
	sp=0;
	int resp;
	double a;
	double data1,data2;
	printf("足し算：1,引き算：2,掛け算：3,割り算：4,入力：5,結果表示：9\n");
 
	while(1)
	{
		scanf("%d",&resp);
		if(!resp) break;
		switch(resp)
		{
			case 1:
			{
				data1=pop();
				data2=pop();
				push(data1+data2);
				break;
			}
			case 2:
			{
				data1=pop();
				data2=pop();
				push(data2-data1);
				break;
			}
			case 3:
			{
				data1=pop();
				data2=pop();
				push(data1*data2);
				break;
			}
			case 4:
			{
				data1=pop();
				data2=pop();
				push(data2/data1);
				break;
			}
			case 5:
				scanf("%lf",&a);
				push(a);
				break;
			case 9:
			{
				answer();
				break;
			}
		}
 
	}
 
	return 0;
}
 
void push(double value)
{
	if(isFull())
	{
		printf("満杯で入りませんでした。");
		return;
	}
	else
	{
		stack[sp++]=value;
	}
}
 
double pop(void)
{
	if(isEmpty()) 
		return 0;
	else
		return stack[--sp];
}
 
int isFull(void)
{
	//1だったら満杯、0だったら満杯じゃない
	if(sp>=SIZE)
		return 1;
	else
		return 0;
}
 
int isEmpty(void)
{
	//1だったら空、0だったら空じゃない
	if(sp<=0)
		return 1;
	else
		return 0;
}
void answer(void)
{
	if(!isEmpty())
		printf("計算結果：%lf\n",stack[0]);
	else
		printf("スタックが空です。\n");
}
void reset(void)
{
	sp=0;
}
 

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NQoxCjUKMgoxCjkKMA==

5
1
5
2
1
9
0