#include <bits/stdc++.h>
#define pb push_back
#define optimize ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define ll long long
#define FILEIN "evaluare.in"
#define FILEOUT "evaluare.out"
using namespace std;
ifstream fin(FILEIN);
ofstream fout(FILEOUT);
void citire();
int vf = 0;
int prio(char x)
{
	if( x=='(' || x == ')')
		return 0;
	if( x=='+' || x=='-') 
		return 1;
 	
 	return 2;
}
int operatie ( int a, int b, char c )
{
	//cout << a<< c <<b;
		switch (c)
	{
		case '+': return a+b; 
		case '-': return a-b; 
		case '*': return a*b; 
		case '/': return a/b;
		//default : throw ("rau");
	}
}
int eval(char []);
char x[300001];
int s[100001];
void postfix(char []);
void rez();
void afis();
int main()
{
	fin >> x;
	postfix(x);
	//cout <<x;
	//cout <<x <<'\n';
	fout<< eval(x);
}
void postfix(char x[])
{
	int poz = 0;
	int N =strlen (x);
	char aux[300001] = {0};
	for ( int i = 0 ; i < N ; i++)
	{
		if(isdigit(x[i]))
		{
			aux[poz++] = x[i] ;
		}
		else
		{
			if(i>0  && isdigit(x[i-1]))
				aux[poz++]=' '; 
			if(x[i]=='(')
				s[vf++]=x[i];
			else
				if(x[i]==')')
				{
					while(s[vf-1]!='(')
					{
						aux[poz++]=s[--vf];
					}
					vf--;
				}
			else
			{
				while(vf != 0 && prio(x[i]) <= prio(s[vf-1]))
				{
						aux[poz++]=s[--vf];
				}
				s[vf++] = x[i];
			}
		}
	//	cout << s[vf-1]<<'\n'; 
	//	cout << aux<< '\n';
	}
	if(isdigit(aux[poz-1])) aux[poz++]=' ';
	while(vf!=0)
	{
		aux[poz++] = s[--vf];
	}
	//cout << aux;
	strcpy(x,aux);

}
int eval( char x[])
{
	int N =strlen(x);
	int numar =0;
	for( int i=0 ;i < N ;i ++)
	{
		if(isdigit(x[i])) numar = numar*10 +(x[i]-'0');
		else
			if (x[i]== ' ') {
				s[vf++]=numar;
				numar=0;
			}
		else
		{
			int nr2=s[--vf], nr1= s[--vf];
			s[vf++] = operatie ( nr1 ,nr2 , x[i]);
		}
	}
	return s[vf-1];
}