#include <bits/stdc++.h>
#define par 1000001
#define stea 1000002
#define slash 1000003
#define scad 1000004
using namespace std;

ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

char s[100025];
int st[100004],top;
int main()
{
    int i, x;
    fin.getline(s,100025);
    for(i=0 ;s[i]; i++)
    {
        if(s[i] == '+') ;
        else if(s[i] == '(') st[++top] = par;
        else if(s[i] >='0' && s[i] <='9')
        {
            x = 0;
            while(s[i] >='0' && s[i] <='9')
            {
                x = x * 10 + (s[i] - '0');
                i++;
            }
            i--;
            if(top == 0) st[++top] = x;
            else
            {
                if(st[top] == scad)
                    st[top] = -x;
                else if(st[top] == stea)
                {
                    top--;
                    st[top] *= x;
                }
                else if(st[top] == slash)
                {
                    top--;
                    st[top] /= x;
                }
                else st[++top] = x;

            }
        }
        else if(s[i] == '-') st[++top] = scad;
        else if(s[i] == '*') st[++top] = stea;
        else if(s[i] == '/') st[++top] = slash;
        else
        {
            x = 0;
            while(st[top] != par)
            {
                x += st[top];
                top--;
            }
            st[top] = x;
            top--;
            if(top == 0) st[++top] = x;
            else
            {
                if(st[top] == scad)
                    st[top] = -x;
                else if(st[top] == stea)
                {
                    top--;
                    st[top] *= x;
                }
                else if(st[top] == slash)
                {
                    top--;
                    st[top] /= x;
                }
                else st[++top] = x;

            }
        }

    }
    x = 0;
    for(i=1 ;i<=top; i++)
       x+= st[i];

    fout << x << "\n";


    return 0;
}