public class Kata {
    
    public static int speedLimit(int speed, int[] signals) {
      int penalty = 0;
      
      for (int signal : signals){
        if (speed > signal) {
          if(speed - signal >= 10 && speed - signal < 20) {
            penalty += 100;            
          } else if(speed - signal < 30) {
            penalty += 250;
          } else if (speed - signal >= 30) {
            penalty += 500;
          }
        }
      }
      
      return penalty;
    }
}