#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,p=0;
    cin>>n;
    for(int i=2;i*i<=n;i++){
    	if(n%i==0){
    		if(i==n/i){
            	p=p+i;
            	
            	
        }
        else p=p+i+n/i;
    		
    	
      
    }
}
    cout<<p;
 
    return 0;
}
/**************************************************************
	Problem: 1084
	User: wuzihang
	Language: C++
	Result: Accepted
	Time:29 ms
	Memory:2072 kb
****************************************************************/