#include<iostream>
using namespace std;
int main()
{
	//students enters a simple math
	//expression 6 + 7
	// 8 - 2
	// 5 * 3
	int x, y;
	char op;
	cout << "enter arithmetic expression:\n\n";
	cin >> x >> op >> y;
	cout << x << ' ' << op << ' ' << y << ' '
		<< "= ";
	switch (op)
	{
	case '+':
		cout << x + y; break;
	case '-':
		cout << x - y; break;
	case '*':
		cout << x * y; break;
	default:
		cout << "ILLEGAL OPERATOR!";
	}
	cout << endl << endl;

}