#include <bits/stdc++.h>

using namespace std;

ifstream in("evaluare.in");
ofstream out("evaluare.out");

char s[100005];
char op[50005];
int nr[50005],optop,nrtop,pr[200];


int calculate(int a,int b,char op)
{
	if(op=='+') return a+b;
	else if(op=='-') return a-b;
	else if(op=='*') return a*b;
	else if(op=='/') return a/b;
}
int main()
{
	in>>s;
	pr['+']=1;
	pr['-']=1;
	pr['*']=2;
	pr['/']=2;
	int lung=strlen(s);
	for(int i=0;i<lung;i++)
	{
		if(s[i]=='(')
			op[++optop]=s[i];
		else if(s[i]==')')
		{
			while(op[optop]!='(')
			{
				int ans=calculate(nr[nrtop-1],nr[nrtop],op[optop]);
				optop--;
				nrtop--;
				nr[nrtop]=ans;
			}
			optop--;
		}
		else if(s[i]>='0' && s[i]<='9')
		{
			int number=0;
			while(s[i]>='0' && s[i]<='9')
			{
				number=number*10+s[i]-'0';
				i++;
			}
			i--;
			nr[++nrtop]=number;
		}
		else
		{
			while(optop>0 && pr[op[optop]]>=pr[s[i]])
			{
				int ans=calculate(nr[nrtop-1],nr[nrtop],op[optop]);	
				optop--;
				nrtop--;
				nr[nrtop]=ans;
			}
			op[++optop]=s[i];
		}
	}
	while(optop>0)
	{
		int ans=calculate(nr[nrtop-1],nr[nrtop],op[optop]);
		nrtop--;
		optop--;
		nr[nrtop]=ans;
	}
	out<<nr[nrtop];
	return 0;
}