public class Dance {

  public static void main(String[] args) {
    System.out.println(getPositionAfterSteps(3));
  }

  public static int getPositionAfterSteps(int steps) {
    int pos = 0;
    int current = 0;
    int recent = 0;
    int penultimate = 0;
    for(int step = 0; step < steps; step++){
        if (step == 0) current = 1;
        else if (step == 1) current = -2;
        else current = recent - penultimate;
        pos += current;

        penultimate = recent;
        recent = current;
    }
    return pos;
  }

}