#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;
    //if(i==11) cout<<"n="<<n<<" "<<init[i]<<" "<<init[i+1]<<endl;
    //cout<<"start i="<<i<<endl;
    while( i<n && isdigit(init[i]) )
    {
        nr=nr*10+ (init[i]-'0');
        i++;
        //cout<<"i="<<i<<endl;
        //cout<<"nr="<<nr<<endl;
    }

       // if(nr==0) cout<<i<<endl;
    //cout<<nr<<endl;
    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(i==11) cout<<init[i]<<endl;
        if(isdigit(init[i]) )
            val.push(numere());//,cout<<"numar"<<endl;
        else if (init[i]=='(') op.push(init[i]);//,cout<<"nparanteza deschisa"<<endl;
        else if (init[i]==')')
        {
           // cout<<"nparanteza inchisa"<<endl;
            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
        {
            //cout<<"operator"<<endl;
            while(op.empty()==false && (priority(op.top())>=priority(init[i])))
            {
                //cout<<"in for op"<<endl;
                a=val.top();
                val.pop();
                b=val.top();
                val.pop();
                c=op.top();
                op.pop();
                //cout<<calc(a,b,c)<<endl;
                val.push(calc(a,b,c));
            }
            op.push(init[i]);
        }

        i++;
    //fout<<i<<endl;
    }

 //cout<<endl<<"afara din for";
    while(op.empty()==false)
    {
        a=val.top();
        val.pop();
        b=val.top();
        val.pop();
        c=op.top();
        op.pop();
       // cout<<a<<" "<<b<<" "<<c<<endl;

       // cout<<calc(a,b,c)<<endl;
        val.push(calc(a,b,c));
    }

    fout<<val.top();
    return 0;
}