# -"- coding: utf-8  -"-
print("--- DZ 29.03 --------зад.1-сумма цифр числа  -----------")
N = int(input('N шестизначное число '))
s  = 0
for i in range(6) :
    s = s + N%10
    N = N//10
print(s)
print("-------------------- зад.2-квадрат числа ------------- ")
N = int(input('N '))
s = 0
for i in range( N, 0 ,-1) :
    s = s + 2*i - 1
print(s)
print("--------------------- зад.3-количество перемен знака чисел --------")
#a = [1,-3,-6,8,10,2,-1,0,0,11]
i = 0
a = []
for i in range(10) :
    a.append(int(input("введите 10 +-целых чисел ")))
for i in range(10) :
    if i == 0 :
        s = 0
    elif i > 0 and a[i] > 0 and a[i-1] < 0 :
        s += 1
    elif i > 0 and a[i] < 0 and a[i-1] > 0 :
        s += 1
    elif i > 0 and a[i] > 0 and a[i-1] == 0 and a[i-2] < 0 :
        s += 1
    elif i > 0 and a[i] < 0 and a[i-1] == 0 and a[i-2] > 0 :
        s += 1
    elif i > 0 and a[i] > 0 and a[i-1] == 0 and a[i-2] == 0 and a[i-3] < 0 :
        s += 1
    elif i > 0 and a[i] < 0 and a[i-1] == 0 and a[i-2] == 0 and a[i-3] > 0 :
        s += 1
print(a)
print('изменений знака чисел :'+ str(s))