courses, points = tuple(map(int, input("").split(" "))) numerators = map(int, input("").split(" ")) denominators = map(int, input("").split(" ")) fitness = lambda frac: (frac[0]+1)/(frac[1]+1) - (frac[0]/frac[1]) fractions = list(sorted(zip(numerators, denominators), key=fitness, reverse=True)) i = 0 for point in range(points): # print(fractions[0][0], "/", fractions[0][1], "=", fractions[0][0]/fractions[0][1]) fractions[0] = (fractions[i][0]+1, fractions[i][1]+1) if len(fractions) >= 2 and fitness(fractions[0]) < fitness(fractions[1]): fractions.sort(key=fitness, reverse=True) total = 0 for (num, denom) in fractions: total += num/denom print((total/courses)*100)