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#include <iostream>
using namespace std;
int operate(char op)
{
int a = 0,b;
char c;
for(int j = 0; j < 2; j++)
{
b = a;
cin >> c;
if(cin.eof())
{
return a;
}
if(c != '+' && c != '-' && c != '*')
{
a = c - 48;
}
else
{
a = operate(c);
}
}
switch(op)
{
case '+':
return b+a;
break;
case '-':
return b-a;
break;
case '*':
return b*a;
break;
}
}
int main()
{
cout << operate(0) << endl;
return 0;
}
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