#include <fstream>
#include <cstring>
using namespace std;
char s[100001];
int nr, k1, k2, st2[100001], rez, i, pr[300];
char st1[100001];

int operatie (char c, int a, int b)
{
    if (c=='+')
        return a+b;
    else if (c=='-')
        return a-b;
    else if (c=='*')
        return a*b;
    else if (c=='/')
        return a/b;
}

int main () {
    ifstream fin ("evaluare.in");
    ofstream fout ("evaluare.out");
    fin>>s;
    pr['+']=1;
    pr['-']=1;
    pr['(']=0;
    pr[')']=0;
    pr['*']=2;
    pr['/']=2;
    for (i=0;s[i]!=0;i++) {
        if (s[i]>='0' && s[i]<='9') {
            nr=0;
            while (s[i]>='0' && s[i]<='9') {
                nr=nr*10+s[i]-'0';
                i++;
            }
            i--;
            st2[++k2]=nr;
        }else
            if (s[i]=='(')
                st1[++k1]='(';
        else
            if (s[i]==')') {
                while (st1[k1]!='(') {
                    rez=operatie(st1[k1], st2[k2-1], st2[k2]);
                    k1--; k2--;
                    st2[k2]=rez;
                }
                k1--;
            }
        else {
            while (k1>0 && pr[st1[k1]]>=pr[s[i]]) {
                rez=operatie(st1[k1], st2[k2-1], st2[k2]);
                k1--; k2--;
                st2[k2]=rez;
            }
            st1[++k1]=s[i];
        }
    }

    while (k1>0 && pr[st1[k1]]>=pr[s[i]]) {
        rez=operatie(st1[k1], st2[k2-1], st2[k2]);
        k1--;k2--;
        st2[k2]=rez;
    }

    fout<<st2[1];
    return 0;
}