03. Combinations

n = int(input())
count = 0 # броят на комбинациите x1 + x2 + x3 == n

# x1 -> 0 до n
# x2 -> 0 до n
# x3 -> 0 до n

for x1 in range(n + 1):
  for x2 in range(n + 1):
    for x3 in range(n + 1):
      if x1 + x2 + x3 == n:
        count += 1

print(count)