#include<stdio.h>
int main()
{
int a,b;
char ch;
scanf ("%d %d %c",&a,&b,&ch);
if ((ch == '+')||(ch == '-')||(ch == '*')||(ch == '/'))
{
switch (ch)
{
case ('+'):
printf ("%d",a + b);
break;
case ('-'):
printf ("%d",a - b);
break;
case ('*'):
printf ("%d",a * b);
break;
case ('/'):
{
if(b == 0)
printf ("Divided by zero!");
else
printf ("%d",a / b);
}
}
}
else printf ("Invalid operator!");
return 0;
}