#include <stdio.h>
#include <stdlib.h>
#define MAXSIZE 20
typedef struct
{
    int value[MAXSIZE];
    int top;
} SqStack;

void InitStack(SqStack &s)
{
    s.top = -1;
}
bool StackEmpty(SqStack s)
{
    if (s.top == -1)
    {
        return true;
    }
    else
        return false;
}
bool StackFull(SqStack s)
{
    if (s.top == MAXSIZE - 1)
    {
        return true;
    }
    else
        return false;
}
bool Push(SqStack &s, int e)
{
    if (s.top == MAXSIZE - 1)
    {
        return false;
    }
    s.value[++s.top] = e;
    return true;
}
void PrintStack(SqStack s)
{
    for (int i = 0; i < s.top + 1; i++)
    {
        printf("%d ", s.value[i]);
    }
}
bool Pop(SqStack &s, int &e)
{
    if (s.top == -1)
    {
        return false;
    }
    e = s.value[s.top--];
    return true;
}
double Postfix(SqStack &s)
{
    double num = 0;
    int i = 0;
    char data[100];
    char ch = getchar();
    while (ch != '$')
    {
        i = 0;
        while (ch >= '0' && ch <= '9' || ch == '.')
        {
            data[i] = ch;
            i++;
            ch = getchar();
        }
        num = atof(data);
        }
    printf("%f", num);
}
int main()
{
    SqStack S;
    InitStack(S);
    Postfix(S);
}