#include<bits/stdc++.h>
#define loop(i,a,b) for(int i=a;i<=b;i++)
#define ll long long
#define ar array
#define ln '\n';
#define pb push_back
#define p push
#define cin f
#define cout g
using namespace std;
ifstream f("evaluare.in");
ofstream g("evaluare.out");
string s;
stack<int> val,op;
int precedence(char x){
if(x=='+'||x=='-')return 1;
else if(x=='*'||x=='/')return 2;
return 0;
}
int calculefectiv(int a,int b,char semn){
if(semn=='+')return a+b;
else if(semn=='-')return a-b;
else if(semn=='*')return a*b;
else return a/b;
}
int calcul(string s){
for(int i=0;s[i];i++){
    if(s[i]>='0'&&s[i]<='9'){
        int x=0;
        while(s[i]>='0'&&s[i]<='9'){
            x=x*10+(s[i]-'0');
            i++;
        }
        i--;
        val.p(x);
    }
    else if(s[i]=='(')op.push(s[i]);
    else if(s[i]==')'){
        while(op.top()!='('){
        int a=val.top();val.pop();
        int b=val.top();val.pop();
        char semn=op.top();op.pop();
        int ans=calculefectiv(a,b,semn);
        val.p(ans);
        }
        op.pop();
    }
    else{
        while(!op.empty()&&precedence(op.top())>=precedence(s[i])){
            int a=val.top();val.pop();
            int b=val.top();val.pop();
            int rez=calculefectiv(a,b,op.top());
            val.p(rez);
            op.pop();
        }
        op.push(s[i]);
    }
}
while(!op.empty()){
    int a=val.top();val.pop();
    int b=val.top();val.pop();
    int rez=calculefectiv(a,b,op.top());
    val.p(rez);
    op.pop();
}
return val.top();
}

int main(){
cin>>s;
cout<<calcul(s);
}
/**
#include <iostream>
#include <fstream>
#include <stack>
using namespace std;
ifstream fi("date.in");
ofstream fo("date.out");
string s;
stack <int>val,op;
int precedence(char sign)
{
    if(sign=='+' || sign=='-')
        return 1;
    if(sign=='*' || sign=='/')
        return 2;
    return 0;
}
int calculEfectiv(int a,int b,char semn)
{
    if(semn=='+')
        return a+b;
    else if(semn=='-')
        return a-b;
    else if(semn=='*')
        return a*b;
    else
        return a/b;
}
int calcul(string s)
{
    int index=0;
    while(index<s.length())
    {
        if(s[index]==' ')
            continue;
        if(s[index]>='0' && s[index]<='9')
        {
            int numar=0;
            while(s[index]>='0' && s[index]<='9')
            {
                numar=numar*10+(s[index]-'0');
                index++;
            }
            val.push(numar);
            index--;
        }else if(s[index]=='(')
            op.push(s[index]);
        else if(s[index]==')')
        {
            while(!op.empty() && op.top()!='(')
            {
                int a=val.top();
                val.pop();
                int b=val.top();
                val.pop();
                char semn=op.top();
                op.pop();
                int rez=calculEfectiv(b,a,semn);
                val.push(rez);
            }
            op.pop();
        }else
        {
            while(!op.empty() && precedence(op.top())>=precedence(s[index]))
            {
                int a=val.top();
                val.pop();
                int b=val.top();
                val.pop();
                int rez=calculEfectiv(b,a,op.top());
                val.push(rez);
                op.pop();
            }
            op.push(s[index]);
        }
        index++;
    }
    while(!op.empty())
    {
        int a=val.top();
        val.pop();
        int b=val.top();
        val.pop();
        int rez=calculEfectiv(b,a,op.top());
        op.pop();
        val.push(rez);
    }
    return val.top();
}
int main()
{
    fi>>s;
    fo<<calcul(s);
    return 0;
}
*/