// TODO: find more triplets for different n

sclass TripletLSFR {
  // params
  int n;
  int start = 1;
  int a, b, c; // the triplet
  
  // changing variables
  int step, value;
  
  // triplets mask for different n's (TODO)
  static final int[] triplesTable = {};
  
  *(int *n, int *a, int *b, int *c) {
    value = start;
  }
  
  int cycleLength() { ret (1 << n)-1; }
  
  int next() {
    int mask = ((1 << n)-1);
    step = (step+1) & mask;
    
    int x = value;
    x ^= (x << a) & mask;
    x ^= x >>> b;
    x ^= (x << c) & mask;
    ret value = x;
  }
}