baekjoon 20260216

2026-02-16 23:43:48 +09:00 · 2026-02-16 23:43:48 +09:00 · 0e715c9c81
commit 0e715c9c81
parent 27ae010fdf
1 changed files with 10 additions and 0 deletions
--- a/code_study/Baekjoon/python/2921.py
+++ b/code_study/Baekjoon/python/2921.py
@ -0,0 +1,10 @@
+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)