#include <stdio.h>
#include <stack>
#include <stdio.h>
#define LMax 100005

using namespace std;

const char IN[]="evaluare.in",OUT[]="evaluare.out";

char s[LMax],p[LMax];

void strToPol(char *s,char *p)
{
	int i,l=0;
	stack<char> st;
	st.push('\0');
	for (i=0;s[i]!='\0';i++)
	{
		while (s[i]>='0' && s[i]<='9' && s[i])
		{
			p[l++]=s[i++];
		}
		if (s[i-1]>='0' && s[i-1]<='9') p[l++]=' ';
		if (s[i]=='+' || s[i]=='-')
		{
			while ( (st.top()!='\0' && st.top()!='(')&& (st.top()=='+' || st.top()=='-'|| st.top()=='*' || st.top()=='/')) 
				p[l++]=st.top(),st.pop();
			st.push(s[i]);
		}
		if (s[i]=='*' || s[i]=='/')
		{
			while ( (st.top()!='\0' && st.top()!='(') && (  st.top()=='*' || st.top()=='/' ) )
				p[l++]=st.top(),st.pop();
			st.push(s[i]);
		}
		if (s[i]=='(')
			st.push(s[i]);
		if (s[i]==')')
		{
			while (st.top()!='(')
				p[l++]=st.top(),st.pop();
			st.pop();
		}
	}
	while (st.top()!='\0')
		p[l++]=st.top(),st.pop();
}

int EvalPol(char *p)
{
	int i;
	stack<int> st;
	for (i=0;p[i]!='\0';i++)
	{
		if (p[i]>='0' && p[i]<='9')
		{
			int x=0;
			while (p[i]>='0' && p[i]<='9')
				x= x*10 + p[i]-'0',i++;
			st.push(x);
		}
		if (p[i]=='+' || p[i]=='-' || p[i]=='*' || p[i]=='/')
		{
			int x,y;
			y=st.top(),st.pop();
			x=st.top(),st.pop();
			if (p[i]=='+')
				st.push(x+y);
			if (p[i]=='-')
				st.push(x-y);
			if (p[i]=='*')
				st.push(x*y);
			if (p[i]=='/')
				st.push(x/y);
		}
	}
	return st.top();
}

int main()
{
	freopen(IN,"r",stdin);
	fgets(s, LMax , stdin);
	fclose(stdout);
	s[strlen(s)-1]='\0';
	strToPol(s,p);
	
	freopen(OUT,"w",stdout);
	printf("%d\n",EvalPol(p));
	fclose(stdout);
	return 0;
}