#include<fstream>
#include<stack>
#include<string>

using namespace std;

bool isoperand(char c)
{
	return (c>='0' && c<='9');
}
bool isoperator(char c)
{
	return (c== '+' || c== '-' || c== '*' || c=='/');
}
int getpriority(char op)
{
    if(op=='+' or op=='-') return 1;
    if(op=='*' or op=='/') return 2;
	return 0;
}
int higherpriority(char op1, char op2)
{
	return (getpriority(op1)>=getpriority(op2));
}
string reversepolishnotation(string exp)
{
	stack<char> S;
	string postfix;
	for(int i = 0;i< exp.size();i++)
    {
        bool ok=1;
        if(isoperator(exp[i]) and ok)
        {
            ok=0;
            while(!S.empty() and S.top()!='(' and higherpriority(S.top(),exp[i]))
            {
                postfix+= S.top();
                S.pop();
            }
            S.push(exp[i]);
        }
        if(isoperand(exp[i]) and ok)
        {
            ok=0;
            while(isoperand(exp[i]))
        {
            postfix +=exp[i];
            i++;
        }
        postfix+=' ';
        i--;
        }
        if (exp[i] == '(' and ok)
        {
            ok=0;
            S.push(exp[i]);
        }

        if(exp[i] == ')' and ok)
        {
            ok=0;
            while(!S.empty() and S.top()!='(')
            {
                postfix += S.top();
                S.pop();
            }
            S.pop();
        }
    }
	while(!S.empty())
    {
		postfix += S.top();
		S.pop();
	}
	return postfix;
}
int val(int op1, int op2, char c)
{
    if(c=='+') return op1+op2;
    if(c=='-') return op1-op2;
    if(c=='*') return op1*op2;
    if(c=='/') return op1/op2;
}
int value(string exp)
{
    int answer=0;
    stack <int> S;
    S.push(0);
    for(int i=0;i<exp.size();i++)
    {
        if(isoperand(exp[i]))
        {
            int nr=0;
            while(isoperand(exp[i]))
            {
                nr=nr*10+exp[i]-'0';
                i++;
            }
            S.push(nr);
            i--;
        }
        if(isoperator(exp[i]))
        {
            int op1=S.top();
            S.pop();
            int op2=S.top();
            S.pop();
            S.push(val(op2,op1,exp[i]));
        }
    }
    return S.top();
}
int main()
{
    ifstream f("evaluare.in");
    ofstream g("evaluare.out");
	string exp;
	f>>exp;
	string postfix=reversepolishnotation(exp);
	g<<value(postfix);
	return 0;
}