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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long i,n,S=0;
- double media,k=0;
- cin>>n;
- if(n==1){
- cout<<"1.00";
- }
- else{
- S=1+n;
- k=2;
- for(i=2;i*i<n;i++)
- {
- if(n%i==0){
- S=S + i + n/i;
- k=k+2;
- }
- }
- if(i*i==n){
- S=S+i;
- k=k+1;
- }
- media=floor(S/k*100);
- media=media/100;
- ///media=8.66666;
- cout<<setprecision(2)<<fixed<<media;
- }
- return 0;
- }
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