#include <fstream>
#include <stack>

using namespace std;

stack<int> polo;
stack<char> op;

int priority(char ch)
{
    if (ch=='+'||ch=='-')
        return 1;
    if (ch=='*'||ch=='/')
        return 2;
    return 0;
}

void move_op()
{
    int x,y;
    char semn;
    semn=op.top();
    op.pop();
    y=polo.top();
    polo.pop();
    x=polo.top();
    polo.pop();
    if (semn=='+')
        polo.push(x+y);
    else if (semn=='-')
        polo.push(x-y);
    else if (semn=='*')
        polo.push(x*y);
    else
        polo.push(x/y);
}

int main()
{
    ifstream fin ("evaluare.in");
    ofstream fout ("evaluare.out");
    int nr;
    char ch;
    bool v=0;
    while (fin>>ch)
    {
        if ('0'<=ch&&ch<='9')
            if (v)
                nr=nr*10+(ch-'0');
            else
            {
                v=1;
                nr=ch-'0';
            }
        else
        {
            if (v)
            {
                polo.push(nr);
                v=0;
                nr=0;
            }
            if (ch=='(')
                op.push(ch);
            else if (ch==')')
            {
                while (op.top()!='(')
                    move_op();
                op.pop();
            }
            else
            {
                while (!op.empty()&&priority(ch)<=priority(op.top()))
                    move_op();
                op.push(ch);
            }
        }
    }
    if (v)
        polo.push(nr);
    while (!op.empty())
        move_op();
    fout<<polo.top();
    fin.close();
    fout.close();
    return 0;
}