#include <iostream>
#include <stack>
#include <fstream>
#include <cstring>
using namespace std;

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

stack<int> S;
stack<char> op;
char s[100001];
char ope[] = "+-/*";

int Nr(char s[], int &i)
{
    int nr = 0;

    while (s[i] >= '0' && s[i] <= '9')
    {
        nr = nr * 10 + s[i] - '0';
        i++;
    }
    i--;
    return nr;
}

int Priority(char op)
{
    if (op == '+' || op == '-')
        return 1;
    if (op == '*' || op == '/')
        return 2;

    return 0;
}
void ApplyOp()
{
    int a, b;
    char Op;

    b = S.top();
    S.pop();
    a = S.top();
    S.pop();

    Op = op.top();
    op.pop();

    if (Op == '+')
        S.push(a + b);
    if (Op == '-')
        S.push(a - b);
    if (Op == '*')
        S.push(a * b);
    if (Op == '/')
        S.push(a / b);
}

int main()
{
    fin.getline(s, 100001);
    int i = 0;
    int nr;

    while (s[i] != '\0')
    {
        if (s[i] >= '0' && s[i] <= '9')
        {
            nr = Nr(s, i);
            S.push(nr);
        }
        if (s[i] == '(')
        {
            op.push('(');
        }
        if (strchr(ope, s[i]) != NULL)
        {
            while (op.size() != 0 && Priority(op.top()) >= Priority(s[i]))

                ApplyOp();
            op.push(s[i]);
        }
        if (s[i] == ')')
        {
            while (op.top() != '(')

                ApplyOp();
            op.pop();
        }
        i++;
    }
    while (op.size() > 0)

        ApplyOp();

    fout << S.top();

    return 0;
}