IP
118.220.0.0
Created
05-22 23:15
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n = int(input())
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if n == 1:
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print(5)
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else:
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dice = [[0, 1, 3, 6, 10, 15], [0, 6, 11, 15, 18, 20]]
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result = 0
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for i in range(2):
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result += (
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dice[i][5]
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+ dice[i][4] * (2 * (n - 1))
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+ dice[i][2] * (n - 1)
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+ dice[i][1] * 2 * ((n - 2) * (n - 1) // 2)
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+ dice[i][3] * ((n - 2) * (n - 1) // 2)
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)
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print(result)