import random
arr = [random.randint(0, 100) for _ in range(100)]


result = 0
for i in range(100):
	result += a[i]

result = 0
for i in range(10):
	result += a[i * 10]
	result += a[i * 10 + 1]
	result += a[i * 10 + 2]
	result += a[i * 10 + 3]
	result += a[i * 10 + 4]
	result += a[i * 10 + 5]
	result += a[i * 10 + 6]
	result += a[i * 10 + 7]
	result += a[i * 10 + 8]
	result += a[i * 10 + 9]