#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#define max 100
float st[max];
int top=-1;
void push(float st[],float val)
{
    if(top==max-1)
    {
        printf("\nstack overflow");
    }
    else
    {
        top++;
        st[top]=val;
    }
   
}
float pop(float st[])
{
    float val=-1;
    if(top==-1)
    {
        printf("\nStack Underflow - missing operands / insufficient postfix exp");
        exit(0);
    }
    else
    {
        val=st[top];
        top--;
    }
    return val;
}

float evaluatepostfixexp(char exp[])
{
    int i=0;
    float op1,op2,val;
    while(exp[i] != '\0')
    {
        if(isdigit(exp[i]))
        {
            push(st,(float)(exp[i]-'0'));
           
        }
        else if(isalpha(exp[i]))
        {
        float a;
            scanf("%f",&a);
            push(st,a);
           
        }
        if(exp[i]=='+' || exp[i]=='-' || exp[i]=='*' || exp[i]=='/' || exp[i]=='%')
        {
            op2=pop(st);
            op1=pop(st);
            switch(exp[i])
            {
                case '+':
                val=op1+op2;
                break;
                case '-':
                val=op1-op2; break;
                case '*':
                val=op1*op2; break;
                case '/':
                val=op1/op2; break;
                case '%':
                val=(int)op1%(int)op2; break;
            }
            push(st,val);
        }
        i++;
    }
    double res=pop(st);
    if(top != -1)
    {
        printf("Insufficient POSTFIX Expression");
        exit(0);
    }
    return res;
}
int main()
{
    float val;
    char exp[100];
    scanf("%s",exp);
    val=evaluatepostfixexp(exp);
    printf("The result is : %.2f",val);
}