1.

a = int(input("Введите число a (>= 5): "))

summ = 0

for i in range(5, a+1):

   summ += 1/(i-1)

print(round(summ, 3))

2.

counter = 0

for i in range(1000, 10000):

   if i%10 == i//10%10:

       counter += 1

print(counter)