#24467: python3


qqq123456 (呵呵)

School : 道明中學
ID : 137318
IP address : [36.236.69.178]
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2021-07-27 18:52:37
a042. 平面圓形切割 -- 許介彥 | From: [36.236.137.133] | Post Date : 2021-02-21 13:34

while True:
    try:
        q = int(input())
        a1 = -4
        d = 6
        www = q - 1
        ans = a1 + d * www 
        print(ans)
    except EOFError:
        break
 
 
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