#include <iostream>
using namespace std;

class Triangle {
private:
	int a = 0, b = 0, c = 0;
public:
	Triangle() {}
	Triangle(int a, int b, int c);
	friend istream& operator>>(istream&, Triangle&);
	friend ostream& operator<<(ostream&, Triangle&);
	void show_perimeter() { cout << "Perimeter: " << a + b + c << endl; }
	void show_area() { cout << "Area: " << a * b * c << endl; }
};
Triangle::Triangle(int a, int b, int c) {
	this->a = a;
	this->b = b;
	this->c = c;
}

istream& operator>>(istream& in, Triangle& t) {
	int a, b, c;
	in >> a >> b >> c;
	if ((a <= 0) || (b <= 0) || (c <= 0)) {
		cout << "ERROR: Sides of a triangle cannot be less than or equal to 0" << endl;
		return in;
	}
	t.a = a;
	t.b = b;
	t.c = c;
	return in;
}

ostream& operator<<(ostream& out, Triangle& t) {
	out << t.a << " " << t.b << " " << t.c;
	return out;
}

int main() {
	Triangle a;
	cin >> a;
	a.show_perimeter();

	return 0;
}