#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;
    return 0;
}
int numere()
{
    int nr=0;
    while( i<n && isdigit(init[i]) )
    {
        nr=nr*10+ (init[i]-'0');
        i++;
    }
    i--;
    return nr;
}
int calc (int a, int b, char op)
{
    switch (op)
    {
    case '*':
        return b*a;
    case '/':
        return b/a;
    case '+':
        return b+a;
    case '-':
        return b-a;
    }
}
int main()
{
    fin.get(init,100005);
    n=strlen(init);
    i=0;
    while(i<n)
    {
        if(isdigit(init[i]) )
            val.push(numere());
        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;
}