import sys


levels, trunk, leaves = [x.split(" ") for x in sys.stdin.readlines()][0]
levels = int(levels)
top = levels // 2 + 1

for x in range(top):
    pad = " "*(top-x)
    print(pad+(leaves*(x * 2 + 1))+pad)
pad = " "*((levels - 3)//2)
print(pad+" "+trunk*3+pad)