#include<cmath> // For sqrt function
#include<iostream>
using namespace std;

class vector2d {
	public:
		double x, y;
		double magnitude(){
			return sqrt(x*x + y*y);
		}

};

int main(){
	vector2d t;
	t.x = 1;
	t.y = 1;

	cout << t.magnitude() << endl;
}