def main():
    N = int(input())
    Y = list(map(int, input().split()))
    def check(mid_left, mid_right):
        sum1 = 0
        sum2 = 0
        for i in range(N):
            sum1 += abs(mid_left-Y[i])
            sum2 += abs(mid_right-Y[i])
        if sum1 >= sum2:
            return True
        else:
            return False
    high = 10 ** 9 + 1
    low = -(10**9 + 1)
    while abs(high - low) > 0.000000001:
        mid_left = high / 3 + low * 2 /3
        mid_right = high * 2 / 3 + low / 3
        if check(mid_left, mid_right):
            low = mid_left
        else:
            high = mid_right 

    ans = 0
    for i in range(N):
        ans += abs(int(high) - Y[i])
    print(ans)




if __name__ == "__main__":
    main()