#include <fstream>
#include <cstring>

using namespace std;

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

struct stackchar
{
    char val[100000];
    int varf;
};

struct stackint
{
    int val[100000];
    int varf;
};

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

void postfix(char *exp, char *post)
{
    stackchar stiva;
    stiva.varf=-1;

    int j=0;

    for(int i=0;exp[i]!=0;)
    {
        if(exp[i]>='0' && exp[i]<='9')
        {
            while(exp[i]>='0' && exp[i]<='9')
                post[j++]=exp[i++];
            post[j++]=' ';
        }

        if(exp[i]=='+' || exp[i]=='-' || exp[i]=='*' || exp[i]=='/')
        {
            if(stiva.varf==-1)
                stiva.val[++stiva.varf]=exp[i++];
            else
            {
                while(priority(exp[i])<=priority(stiva.val[stiva.varf]))
                {
                    post[j++]=stiva.val[stiva.varf--];
                    post[j++]=' ';
                }
                stiva.val[++stiva.varf]=exp[i++];
            }
        }

        if(exp[i]=='(')
        {
            stiva.val[++stiva.varf]=exp[i++];
        }
        if(exp[i]==')')
        {
            while(stiva.val[stiva.varf]!='(')
            {
                post[j++]=stiva.val[stiva.varf--];
                post[j++]=' ';
            }
            stiva.val[stiva.varf--];
            ++i;
        }
    }

    while(stiva.varf!=-1)
    {
        post[j++]=stiva.val[stiva.varf--];
        post[j++]=' ';
    }
    post[j]=0;
}

int evaluare(char *exp)
{
    stackint stiva;
    stiva.varf=-1;
    int nr;
    for(int j=0;exp[j]!=0;)
    {
        if(exp[j]==' ')
            ++j;
        if(exp[j]>='0' && exp[j]<='9')
        {
            nr=0;
            while(exp[j]>='0' && exp[j]<='9')
                nr=nr*10+(exp[j++]-'0');
            stiva.val[++stiva.varf]=nr;
        }

        if(exp[j]=='+' || exp[j]=='/' || exp[j]=='*' || exp[j]=='-')
        {
            nr=stiva.val[stiva.varf--];
            if(exp[j]=='+')
                stiva.val[stiva.varf]+=nr;
            if(exp[j]=='-')
                stiva.val[stiva.varf]-=nr;
            if(exp[j]=='*')
                stiva.val[stiva.varf]*=nr;
            if(exp[j]=='/')
                stiva.val[stiva.varf]/=nr;
                j++;
        }
    }
    return stiva.val[stiva.varf];
}

char exp[100001], post[300001];
int rez;

int main()
{
    fin.getline(exp, 100000);
    postfix(exp, post);
    rez=evaluare(post);
    fout<<rez;
    return 0;
}