#include <cstdio>
#include <cstring>
#define IN "eva;uare.in"
#define OUT "evaluare.out"

char s[100010];
char *p=s;
char semn[4][4] = {"+-", "*/", "^", ""};
const long hmax = 2;

void scan()
{
	freopen(IN,"r",stdin);
	freopen(OUT, "w",stdout);
	gets(s);
}

int op(int x, int y, char c) 
{
	switch ( c ) 
	{
		case '+': return x+y;
		case '-': return x-y;
		case '*': return x*y;
		case '/': return x/y;
	}
	return 0;
}

int eval(int);

int element() 
{
	int r=0;
	if ( *p == '(' )
	{
		++p; r = eval(0); ++p;
	}
	else 
	{
		while ( strchr("0123456789", *p) )
			r = r*10 + *(++p-1) - '0';
	}
	return r;
}

int eval(int h) 
{

	int r = (h==hmax)?element():eval(h+1);
	
	while ( strchr(semn[h], *p) ) 
		r = op(r, eval(h+1), *(++p-1));
	return r;
}


int main() 
{
	scan();
	printf("%d\n", eval(0));
	return 0;
}