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#include <iostream>
using namespace std;
int main() { 
        int n ; 
        cin>>n; 
        cout<<2*n*n-n;
 return 0 ;
}

Success #stdin #stdout 0s 16064KB

stdin

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stdout

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https://ideone.com/i69Q0H

Решение задачи 472

language:

C++ (gcc 8.3)

created:

visibility:

public

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