#include
int main()
{
int what,m,n;
char ch;
scanf("%d %d %c",&m,&n,&ch);
switch(ch)
{
case '+':
printf("%d",m+n);
break;
case '-':
printf("%d",m-n);
break;
case '*':
printf("%d",m*n);
break;
case '/':
if(n==0)
printf("Divided by zero!n");
else
printf("%d",m/n);
break;
default:
printf("Invalid operator!n");
}
return 0;
}



