double value = 0;
        double preValue;
        int n = 1;
        int k = 1;
        if (Math.abs(arg - 1) <= 1) {
            do {
                preValue = value;
                value -= ((Math.pow(-1, n) * Math.pow(-1 + arg, n)) / n);
                n++;
            } while (accuracy <= Math.abs(value - preValue) && n < MAX_ITERATIONS);
        } else if (Math.abs(arg - 1) > 1) {
            do {
                preValue = value;
                value += calc(arg - 1) - ((Math.pow(-1, n) * Math.pow(-1 + arg, n)) / n);
                k++;
            } while (accuracy <= Math.abs(value - preValue) && k < MAX_ITERATIONS);
        }