#include <iostream>
#include <fstream>
using namespace std;
int termen(), factor(), expresie();
char s[100001];
int p;
int expresie()
{
    int sum = termen();
    while(s[p]=='+' || s[p]=='-')
    {
        if(s[p]=='+'){
            p++;
            sum+=termen();
        }else{
          p++;
          sum-=termen();
          }
    }
    return sum;
}
int termen()
{
    int prod=factor();
    while(s[p]=='*'||s[p]=='/'){
            if(s[p]=='*'){
                p++;
                prod*=factor();
            }else{
                p++;
                prod/=factor();
                }
    }
    return prod;
}
int factor()
{
    int val=0, semn=1;
    while(s[p]=='-'){
        p++;
        semn = -semn;
    }
    if(s[p]=='('){
        p++;
        val=expresie();
        p++; // ca sa trec de a doua paranteza !!
        return val*semn;
       }
    while(s[p]>='0' && s[p]<='9'){
        val= val*10 + s[p] - '0';
        p++;
    }
    return semn*val;
}
int main()
{
    int i;
    ifstream in("evaluare.in");
    ofstream out("evaluare.out");
    i=1;
    while(in>>s[i])
        i++;
    p=1;
    out<<expresie();
    return 0;
}