#include <bits/stdc++.h>

using namespace std;
ifstream f("evaluare.in");
ofstream g("evaluare.out");
char *p,s[100005];
double nr()
{
    double rez=0;
    while(isdigit(*p))
    {
        rez=rez*10+*p-'0';
        p++;
    }
    return rez;
}
double eval();
double termen();
double factor();
int main()
{
    f.getline(s,100000);
    p=s;
    g<<setprecision(2)<<fixed;
    g<<eval()<<'\n';
    return 0;
}
double eval()
{
    double r=termen();
    while(*p=='+' || *p=='-')
    {
        if(*p=='+')
        {
            p++;
            r+=termen();
        }
        else
        {
            p++;
            r-=termen();
        }
    }
    return r;
}
double termen()
{
    double r=factor();
    while(*p=='x' || *p==':')
    {
        if(*p=='x')
        {
            p++;
            r*=factor();
        }
        else
        {
            p++;
            r/=factor();
        }
    }
    return r;
}
double factor()
{
    double r=0;
    if(*p=='(')
    {
        p++;
        r=eval();
        p++;
    }
    else
        r=nr();
    return r;
}