# 1
n = int(input())
even,odd = [],[]
for i in range(n+1):
    if i%2==0:
        even.append(i)
    else:
        odd.append(i)

print(*even)
print(*odd)

# 2
n = int(input())
while n<=0:
    n = int(input('Nhap lai: '))

# 3
a = int(input())
n = s = 0
while s<=a:
    n+=1
    s+=1/n
print(n)

1)

n = int(input())
for i in range(1, n + 1):
    if i % 2 == 0:
        print(i, end = ' ')
print('\n')
for i in range(1, n + 1):
    if i % 2 != 0:
        print(i, end = ' ') 

2)

n = int(input("Nhap so phan tu: "))
for i in range(n):
    a = int(input(f"Nhap so thu {i}: "))
    if a < 0:
        print('Nhap lai')
        break

3)

a = int(input())
s = 0
i = 1
while s <= a:
    s += 1.0 / i
    i += 1
print(i - 1)