#include <string>
#include <fstream>
#include <cstdlib>
#define ERROR -(1<<30)

using namespace std;

string expresion;
string::const_iterator it, iend;
const string op[]={ "+-", "*/", "^" };

inline int eval( int a, int b, char op )
{
	switch(op)
	{
		case '+' : return a+b;
		case '-' : return a-b;
		case '*' : return a*b;
		case '/' : return a/b;
		default  : return ERROR;
	}
}
inline int eval( int level )
{
	int x;
	if( 2 == level )
	{
		if( '(' == *it )
		{
			++it;
			x=eval(0);
			++it;
		}
		else for( x=0; it < iend && *it >= '0' && *it <= '9'; ++it )
				x=x*10+*it-'0';
	}
	else for( x=eval(level+1); it < iend && string::npos != op[level].find(*it); )
		 {
			 char op=*it;
			 ++it;
			 x=eval( x, eval(level+1), op );
		 }
	return x;
}
int main()
{
	ifstream in( "evaluare.in" );
	ofstream out( "evaluare.out" );

	getline( in, expresion );

	it=expresion.begin();
	iend=expresion.end();

	out<<eval(0)<<'\n';

	return EXIT_SUCCESS;
}