No, for every player add we have to modulate (I think that's the name, 10 mod 3 = 1 etc) the total acquired wins with the number of participating mods, and for every count we increase the modulus by one until we finally can reach 50. (for <50 wins assume we have 50 wins.)
When mods subtract they have to first factor the current number into prime factors, then square them by one another (i.e. number = 36 = 3 * 3 * 2 * 2 gives 3^3^2^2) and subtract that number.