Monster EXP * Server EXP Rate * [(1.1 + 0.05 * N)/ (N + 1)] * (your level/average party level) * HS bonus N = Number of people in the party. (yourlevel/average party level) cannot exceed 1 (in the case where your level is higher than the person who is leeching you) and is rounded down (60.5 -> 60) The result of the equation is also rounded down.