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

using namespace std;
string expresion, t;
string::const_iterator it, iend;
inline int priorityOp( char op )
{
	switch(op)
	{
		case '+' : ;
		case '-' : return 1;
		case '*' : ;
		case '/' : return 2;
		case ')' : return 3;
	}
	return -1;
}
inline void transform()
{
	stack< char > s;
	for( it=expresion.begin(), iend=expresion.end(); it < iend;  )
	{
		if( *it >= '0' && *it <= '9' )
		{
			for( ; it < iend && *it >= '0' && *it <= '9'; ++it )
				t.push_back(*it);
			t.push_back('.');
		}
		else {
				if( '(' == *it )
					s.push('('), ++it;
				else if( ')' == *it )
					 {
						 for( ++it; '(' != s.top(); s.pop() )
							 t.push_back(s.top());
						 s.pop();						 
					 }
					 else {
							for( int p=priorityOp(*it); !s.empty() && p <= priorityOp(s.top()); s.pop() )
								t.push_back(s.top());
							s.push(*it);
							++it;
						  }
			 }
	}
	for( ; !s.empty(); s.pop() )
		t.push_back(s.top());
}
inline int eval()
{
	transform();
	stack< int > s;
	int number, a, b;
	it=t.begin();
	iend=t.end();
	for( ; it < iend; ++it )
	{
		if( *it >= '0' && *it <= '9' )
		{
			for( number=0; it < iend && *it >= '0' && *it <= '9'; ++it )
				number=number*10+*it-'0';
			s.push(number);
		}
		else {
				b=s.top(); s.pop();
				a=s.top(); s.pop();
				switch(*it)
				{
					case '+' : s.push(a+b); break;
					case '-' : s.push(a-b); break;
					case '*' : s.push(a*b); break;
					case '/' : s.push(a/b); break;
				}
			 }
	}
	return s.top();
}
int main( void )
{
	ifstream in( "evaluare.in" );
	getline( in, expresion );
	ofstream out( "evaluare.out" );
	out<<eval()<<'\n';
	return EXIT_SUCCESS;
}