19 lines
311 B
Python
19 lines
311 B
Python
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#!/usr/bin/env python3
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from math import gcd
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def main(n):
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c = 3 * n**2
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for x in range(1, n+1):
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for y in range(1, n+1):
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g = gcd(x, y)
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a, b = x//g, y//g
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c += min((n-x)//b, y//a) * 2
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return c
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#print(main(2))
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print(main(50))
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#print(main(500))
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