#include <cstdio>
#include <string>
#include <iostream>
#include <stack>
using namespace std;

string x;
stack<char> a;
stack<int> b;
char pr[256];

int proces(int a,int b,char semn)
{
	if(semn=='+') return a+b;
	if(semn=='-') return a-b;
	if(semn=='*') return a*b;
	if(semn=='/') return a/b;
	return 0;
}

void f()
{
	char semn=a.top();
	a.pop();
	if(semn=='(') return;
	int c=b.top();
	b.pop();
	int d=b.top();
	b.pop();
	b.push(proces(d,c,semn));
	return;
}
int main()
{
	pr['+']=pr['-']=0;
	pr['*']=pr['/']=1;
	pr['(']=pr[')']=3;
	freopen("evaluare.in","r", stdin);
	freopen("evaluare.out","w", stdout);
	getline(cin,x);
	for(unsigned int i=0;i<x.size();i++)
	{

		if(isdigit(x[i]) || ( (i==0 || x[i-1]=='(') && x[i]=='-')  )
		{
			int nr=0,y=1;
			if(x[i]=='-')
			{
				i++;
				y*=-1;
			}
			while(isdigit(x[i]))
			{
				nr=nr*10+x[i]-'0';
				i++;
			}
			nr*=y;
			b.push(nr);
			i--;
			continue;
		}
		else
		{
			if(x[i]=='(') a.push(x[i]);
			else if(x[i]==')')
			{
				while(a.top()!='(') f();
				a.pop();
			}
			else
			{
				while(a.size()>0 && pr[x[i]]<=pr[a.top()] && a.top()!='(')
				{
					f();
				}
				a.push(x[i]);

			}
		}
	}
	while(a.size()) f();
	printf("%d",b.top());

	return 0;
}