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Create 1110.cpp

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Kirigaya Kazuto 2016-08-05 11:56:39 +08:00 committed by GitHub
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commit 373dae1453
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#include <iostream>
int main(){
long long re,n;
std::cin>>n;
re=n*(n+1)*(2*n+1);
re/=6;
std::cout<<re;
return 0;
}