online_judge_1116

#include <iostream>

using namespace std;

int jie(int n)
{
if(n == 0)
return 1;
int s = 1;
while(n)
{
s *= n;
n--;
}
return s;
}
int main()
{
int a, b;
char c;
int ans;
bool flag;
while(cin>>a)
{
cin>>c;
if(c != '!')
cin>>b;
cin.ignore();
flag = false;
switch(c)
{
case '+':
ans = a+b;
break;
case '-':
ans = a-b;
break;
case '*':
ans = a*b;
break;
case '!':
ans = jie(a);
break;
case '/':
if(b == 0)
{
flag = true;
break;
}
ans = a/b;
break;
case '%':
if(b == 0)
{
flag = true;
break;
}
ans = a%b;
break;
}
if(flag)
cout<<"error"<<endl;
else
cout<<ans<<endl;
}
return 0;
}