Пары, для которых сумма делится на 10

from random import randint

N = 20

k0, k1, k2, k3, k4, k5, k6, k7, k8, k9 = 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

for i in range(N):
    a = randint(0,101)
    a = 100 if i==3 else a
    a = 100 if i==5 else a
    print(a, end=' ')
    if a % 10 == 0:
        k0 += 1
    elif a % 10 == 9:
        k9 += 1
    elif a % 10 == 8:
        k8 += 1
    elif a % 10 == 7:
        k7 += 1
    elif a % 10 == 6:
        k6 += 1
    elif a % 10 == 5:
        k5 += 1
    elif a % 10 == 4:
        k4 += 1
    elif a % 10 == 3:
        k3 += 1
    elif a % 10 == 2:
        k2 += 1
    elif a % 10 == 1:
        k1 += 1

a0 = k0 * (k0 - 1) / 2
a1 = k1 * k9
a2 = k2 * k8
a3 = k3 * k7
a4 = k4 * k6
a5 = k5 * (k5 - 1) / 2

print()
print(int(a0 + a1 + a2 + a3 + a4 + a5))