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- #include <iostream>
- using namespace std;
- int main(){
- int n , i;
- long long S = 0;
- cin >> n;
- for(i=1 ; i*i<n ; i++)
- if(n % i == 0)
- S += i + n / i;
- if(i * i == n)
- S += i;
- cout << S;
- return 0;
- }
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