#include<iostream> using namespace std; int main(){ int a,i=1,sum=0; cin>>a; while(i<=a/2&&i<=a/i){ if(a%i==0&&i!=a/i){ sum=sum+i+a/i; } if(a%i==0&&i==a/i){ sum=sum+i; } else if(a%i!=0) break; i++; } cout<<sum; return 0; }