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+1
Wow, I didn't know there has been $$$4.02387260077\times 10^{2564}$$$ codeforces rounds? |
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0
It is Euler's totient function. $$$\varphi(N)$$$ returns the number of positive integers $$$n\le N$$$ such that $$$n$$$ and $$$N$$$ are coprime, ie, have $$$\gcd(n,\,N)=1$$$. |
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