12行AC

#include <iostream>
using namespace std;
int ygnn_bpkn(short n){
    int yzh=0;
    for(short i=1;i<=n;i++){
        if(n%i==0) yzh+=i;
    }
    return yzh;
}
int main(){
    short n;cin>>n;cout<<ygnn_bpkn(n)<<endl;
}