n = int(input("Enter a number: "))
for i in range(1, n):
    for j in range(1, n-i):
        print(" ", end=" ")
    for k in range(i, 0, -1):
        print(k, end=" ")
    for l in range(2, i+1):
        print(l, end=" ")
    print()

# Coded By DHIRAJ SHELKE