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

class Vector {
    float degree;
    int speed;
    Vector(float deg, int sped) {
        degree = deg;
        speed = sped;
    }
    void sum(Vector v) {
        int vx = sin(v.degree)*v.speed + sin(degree)*speed;
        int vy = cos(v.degree)*v.speed + cos(degree)*speed;
        speed = sqrt(pow(vx,2) + pow(vy,2));
        degree = atan(vx/vy);
    }
};

class Particle {
    int x;
    int y;
    Vector v;
    Particle(int xi, int yi) {
        x = xi;
        y = yi;
        v = new Vector(0,0);
    }
    int distance(Particle p) {
        return sqrt(abs(pow(p.x-x, 2)+pow(p.y-y,2)));
    }
    float offset(Particle p) {
        return tan(abs((p.x - x)/(p.y - y)));
    }
    void apply(Particle p) {
        int hyp = 1/distance(p);
        float f = offset(p);
        v.sum(new Vector(f, hyp));
    }
};
int main() {

    return 0;
}