static class geoNeuron{
  double x,y;
  double wx,wy;
  geoNeuron(double x, double y){
    this.x = x;
    this.y = y;
    this.wx = Math.random();
    this.wy = Math.random();
  }
  double dist(geoNeuron c){
    double dx = this.x - c.x;
    double dy = this.y - c.y;
    return Math.sqrt(dx*dx + dy*dy);	
  }
  double wdist(geoNeuron c){
    double dx = this.wx - c.wx;
    double dy = this.wy - c.wy;
    return Math.sqrt(dx*dx + dy*dy);		
  }
}