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- #include <iostream>
- using namespace std;
- int p=3;
- int main()
- {
- int n;
- cin>>n;
- int x=0;
- n+=1;
- int o=0;
- int k=1;
- int z=3;
- for(int y; y<n; y+=1){
- o+=x;
- x+=p;
- p=p+3;
- }
- cout<<o;
- return 0;
- }
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