public static CalculationMethod get(int id){
    	switch (id) {
		case 0:
			return Jafari;
		case 1:
			return Karachi;
		case 2:
			return ISNA;
		case 3:
			return MWL;
		case 4:
			return Makkah;
		case 5:
			return Egypt;
		case 6:
			return Tehran;
		default:
			return Custom;
		}
    }