#include <cmath>
#include <iostream>

using namespace std;

const double PI = 3.141592653589793238462643383279502884197169399;

void rotateLeft (double &x, double &y, double ang){
  double nx = cos(ang) * x - sin(ang) * y;
  double ny = sin(ang) * x + cos(ang) * y;
  x = nx; y = ny;
}

double det (double a, double b, double c, double d){
  return a * d - b * c;
}

void computeCenter (double x1, double y1, double x2, double y2,
		    double x3, double y3, double &x, double &y){
  double mx1 = (x1+x2)/2, my1 = (y1+y2)/2;
  double mx2 = (x2+x3)/2, my2 = (y2+y3)/2;
  double nx1 = -(y2-y1), ny1 = (x2-x1);
  double nx2 = -(y3-y2), ny2 = (x3-x2);

  double a = nx1, b = -nx2, c = mx2 - mx1;
  double d = ny1, e = -ny2, f = my2 - my1;

  double t1 = det(c,b,f,e) / det(a,b,d,e);
  double t2 = det(a,c,d,f) / det(a,b,d,e);
  
  x1 = mx1 + nx1*t1;
  y1 = my1 + ny1*t1;
  x2 = mx2 + nx2*t2;
  y2 = my2 + ny2*t2;

  x = (x1+x2)/2;
  y = (y1+y2)/2;
}

int main (){
  int T, k1, k2;
  double x1, y1, x2, y2, x3, y3, x, y, dist;

  while (true){
    cin >> T >> k1 >> k2;
    if (T == 0 && k1 == 0 && k2 == 0) break;
    cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;

    // rotate moon positions so that planet P is in the same position
    // relative to start S
    rotateLeft (x1, y1, (2.0*PI*(k1+k2))/T);
    rotateLeft (x2, y2, (2.0*PI*k2)/T);

    // now, planet P is the point which is equidistant from all three
    // moon positions -- the circumcenter of the triangle formed by
    // the three points
    computeCenter (x1, y1, x2, y2, x3, y3, x, y);
    dist = sqrt(x*x+y*y);

    cout << (int)(dist + 0.5) << endl;
  }
  
  return 0;
}