n = int(input()) a = list(map(int,input().split())) a.sort() j = 0 res = [0]*a[-1] s = 1 for i in range(1, a[-1]+1): s = 1 while a[j] < i: j += 1 for k in range(j, len(a)): s *= i / a[k] s -= sum(res) res[i-1] = s res1 = 0 for i in range(a[-1]): res1 += (i...