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- #include <iostream>
- using namespace std;
- int main()
- {
- ios_base::sync_with_stdio(0);
- cout.tie(0);
- cin.tie(0);
- int n;
- cin>>n;
- int suma=0;
- for(int i=0; i<=n; i++)
- {
- suma+=i;
- }
- cout<<suma;
- return 0;
- }
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