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songyc macbook 2026-02-16 23:43:48 +09:00
parent 27ae010fdf
commit 0e715c9c81
1 changed files with 10 additions and 0 deletions
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code_study/Baekjoon/python/2921.py Normal file
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N = int(input())
sigma = lambda k : int(0.5*k*(k+1))
ans = 0
for n in range(1,N+1) :
if n==1 : ans = 3
else : ans += sigma(n) + n*(n+1)
print(ans)