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Create 1307_chronix.cpp
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VIJOS/1307_chronix.cpp
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10
VIJOS/1307_chronix.cpp
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#include <iostream>
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int main(){
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long long re,n;
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std::cin>>n;
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re=n*(n+1)*(2*n+1);
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re/=6;
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std::cout<<re;
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return 0;
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}
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