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- #include <iostream>
- using namespace std;
- int main()
- {
- int n;
- cin>>n;
- if(n>0){
- int f=0;
- for(int i=1;i<=n;i+=1){
- f+=i*i;
- }
- cout<<f;
- }
- else {
- cout << "Bang bang" << endl;
- }
- return 0;
- }
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