struct Complex {
double R;
double I;
}

typedef struct Complex Complex;

Complex initComplex(double input_R, double input_I) {
  Complex result = { input_R, input_I };
  return result;
}

{
  Complex result;
  result.R = input_R;
  result.I = input_I;
  return result;
}

Complex addComplex(Complex a, Complex b) {
  Complex result;
  result.R = a.R + b.R;
  result.I = a.I + b.I;
  return result;
}

Complex multiplicateComplex(Complex a, Complex b) {
  Complex result;
  result.R = a.R * b.R - a.I * b.I;
  result.I = a.R * b.I + b.R *a.I;
  return result;
}