#include <iostream>
#include <cmath>
using namespace std;

class Point {
private:
    double x, y;

public:
    Point(double xVal, double yVal) {
        x = xVal;
        y = yVal;
    }

    double distanceTo(Point other) {
        return sqrt(pow(x - other.x, 2) + pow(y - other.y, 2));
    }
};

int main() {
    Point p1(1, 2);
    Point p2(4, 6);

    cout << p1.distanceTo(p2) << endl;

    return 0;
}