#include<iostream> int main(){ int a; scanf("%d",&a); int i=1,sum=0; 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++; } printf("%d",sum); return 0; }