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Հավաքել. Սովորեք. Պահպանել. Տիրապետել.
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$$F(n,m)=\sum_{i=1}^{n}\sum_{j=1}^{m} \bigl(i\cdot j\cdot \varphi(\gcd(i,j))\bigr)$$
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The past self is there to be surpassed.
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O || 大蛇小超手123啊
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