int main()
{
	int a, b;
	char c;
	scanf("%d%d%c", &a, &b, &c);
	if (c == ' / ' && b == 0)
	{
		printf("Divided by zero!");
		return 0;
	}
	if (c == '+')
		printf("%d", a + b);
	else if (c == '-')
		printf("%d", a - b);
	else if (c == '*')
		printf("%d", a * b);
	else if (c == '/')
		printf("%d", a / b);
	else
		printf("Invalid operator!");
	return 0;
}