#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define endl '\n'
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rep2(i,a,b) for(int i=int(a);i<int(b);i++)
#define pb emplace_back
#define all(x) (x).begin(),(x).end()
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
	ll n;
	cin>>n;
	vector<ll> a;

	rep2(i,1,sqrt(n)+1){
		if(n%i==0){
			a.pb(i);
			a.pb(n/i);
		}
	}

	sort(all(a));
	a.erase(unique(all(a)),a.end());

	ll ans=0;
	rep(i,a.size()){
		ll tmp=(n-a[i])/a[i];
		if(tmp>a[i])ans+=tmp;
	}
	cout<<ans<<endl;
}

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