#1
n = int(input())
a = [0]
for i in range(n):
    x = int(input())
    a = [i] * x
print(a)
answer: [2, 2, 2]

#2
n = int(input())
a = []
for i in range(n):
    a = a + [i] * i
print(a)
answer: [1, 2, 2]

#3
n = int(input())
a = []
for i in range(n):
    x = int(input())
    a = a + [x]
k = sum(a)
m = len(a)
print(k/m)
answer: 4.2

#4
n = int(input())
m = int(input())
a = []
for i in range(n):
    x = int(input())
    a += [x]
print(a[m])
answer: 32

#5
n = int(input())
a = []
b = []
for i in range(n):
    x = int(input())
    a += [x]

for i in range(len(a)):
    if i % 2 == 0:
        b.append(a[i])
print(a)
print(b)
answer: [1, 2, 3]