#include <bits/stdc++.h>

using namespace std;
ifstream fin ("evaluare.in");
ofstream fout ("evaluare.out");
stack <int> val;
stack <char> op;
char init[100005],c;
int n,i,a,b;

int priority (char c)
{
    if(c=='*') return 2;
    if(c=='/') return 2;
    if(c=='+') return 1;
    if(c=='-') return 1;
}
int numere(int i)
{
    int nr=0;
    while(init[i]>='0' && init[i]<='9' && i<n)
    {
        nr=nr*10+ (init[i]-'0');
        i++;
    }

    return nr;
}
int calc (int a, int b, char op)
{

    switch (op)
    {
    case '*':
        return a*b;
    case '/':
        return a/b;
    case '+':
        return a+b;
    case '-':
        return a-b;
    }

}

int main()
{

    fin.get(init,100005);
    n=strlen(init);
    i=0;
    while(i<n)
    {
        if(init[i]>='0' && init[i]<='9')
             val.push(numere(i));
        else if (init[i]=='(') op.push(init[i]);
        else if (init[i]==')')
        {
            while(op.top()!= '(')
            {
                a=val.top();
                val.pop();
                b=val.top();
                val.pop();
                c=op.top();
                op.pop();
                val.push(calc(a,b,c));
            }
            op.pop();
        }
        else
        {
            while(op.empty()==false && (priority(op.top())>=priority(init[i])))
            {
                a=val.top();
                val.pop();
                b=val.top();
                val.pop();
                c=op.top();
                op.pop();
                val.push(calc(a,b,c));
            }
            op.push(init[i]);
        }

        i++;

    }
    while(op.empty()==false)
    {
        a=val.top();
        val.pop();
        b=val.top();
        val.pop();
        c=op.top();
        op.pop();
        val.push(calc(a,b,c));
    }
    fout<<val.top();
    return 0;
}