#include <string>
#include <cstdlib>
#include <fstream>
#define ERROR -(1 << 30)
using namespace std;

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

inline int eval(char op, int a, int b) 
{
	switch(op)
	{
		case '+' : return a+b;
		case '-' : return a-b;
		case '*' : return a*b;
		case '/' : return a/b;
		default  : return ERROR;
	}
}

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 != opLevel[level].find(*it);)
		 {
			char op = *(it++);
			x = eval(op, x, eval(level+1));
		 }
		 
	return x;
}
int main()
{
	ifstream in("evaluare.in");
	ofstream out("evaluare.out");
	
	getline(in, exp);
	it = exp.begin(), iend = exp.end();
	
	out << eval(0) << '\n';
	
	return EXIT_SUCCESS;
}