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(1, i+1):
        print(i, end=" ")
    for l in range(i-1, 0, -1):
        print(i, end=" ")
    print()

# Coded By DHIRAJ SHELKE