#include <fstream>
#include <stack>
#include <string>
using namespace std;
ifstream cin("evaluare.in");
ofstream cout("evaluare.out");
stack<int>nr;
stack<char>semn;
string s;
int i,pr[256];
int get_number(){
    int n=0;
    while(s[i]>='0'&&s[i]<='9')
        n=n*10+s[i++]-'0';
    return n;
}
void eval(){
    int b=nr.top();
    nr.pop();
    int a=nr.top();
    nr.pop();
    char x=semn.top();
    semn.pop();
    if(x=='+')
        nr.push(a+b);
    else if(x=='-')
        nr.push(a-b);
    else if(x=='*')
        nr.push(a*b);
    else nr.push(a/b);
}
/// +  =  1      -  = 1     *  = 2     /  =  2    (  =   3
int main()
{
    cin>>s;
    pr['-']=pr['+']=1;
    pr['*']=pr['/']=2;
    i=0;
    while(s[i]!=0){
        if(s[i]>='0'&&s[i]<='9'){
            nr.push(get_number());
        }else if(s[i]=='('){
            semn.push(s[i++]);
        }else if(s[i]==')'){
            i++;
            while(semn.top()!='(')
                eval();
            semn.pop();
        }else{
            while(!semn.empty()&&pr[semn.top()]>=pr[s[i]])
                eval();
            semn.push(s[i++]);
        }
    }
    while(!semn.empty())
        eval();
    cout<<nr.top();
    return 0;
}