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- #include <iostream>
- using namespace std;
- int main()
- {
- int n;
- long long S = 0;
- cin>>n;
- for(int i = 1; i * i <= n; ++i){
- if(n % i == 0){
- if(i % 2 == 0)
- S += i;
- if(n / i % 2 == 0)
- S += n / i; }
- if(i * i == n && i % 2 == 0)
- S -= i; }
- cout<<S;
- return 0;
- }
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