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#include <iostream>
using namespace std;
int operate()
{
int a = 0, b;
char c,op;
while(1)
{
cin >> c;
if(cin.eof())
{
return a;
}
if( c == ')' )
{
break;
}
else if( c == '(' )
{
b = a;
a = operate();
}
else if(c != '+' && c != '-' && c != '*')
{
b = a;
a = c - 48;
}
else
{
op = c;
}
}
switch(op)
{
case '+':
return b+a;
break;
case '-':
return b-a;
break;
case '*':
return b*a;
break;
}
}
int main()
{
cout << operate() << endl;
return 0;
}
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