3.py

n = int(input())
a = 1
b = 1
arr = []

while True:
    f = False
    for _ in range(1, b + 1):
        arr.append(a)
        if a == n:
            print(*arr)
            f = True
            break
        a += 1
    
    if f:
        break

    print(*arr)

    arr = []
    b += 1