#include <iostream>

using namespace std;

class FirstClass
{
public:
	int a = 20, b = 20, c;
	FirstClass()
	{
		c = Method::o(a, b);
		cout << c << endl;
	}
};

class Method
{
public:
	static int o(int a, int b)
	{
		int c = a + b;
		return c;
	}
};

int main()
{
	FirstClass cc;

	return 0;
}