#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=10010;
const int mod=998244353;
int n;
int ans;
vector<int>D[N];
bool vis[N];
signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	// freopen("score.in","r",stdin);
	// freopen("score.out","w",stdout);
	for(int i=2;i<=N-10;i++){
		for(int j=i;j<=N-10;j+=i){
			D[j].push_back(i);
		}
	}
	cin>>n;
	for(int i=2;i<=n;i++){
		int cnt=i;
		for(int j=1;j<=i;j++)vis[j]=0;
		for(auto x:D[i])vis[x]=1;
		for(int j=i-1;j>=2;j--){
			bool fl=1;
			for(auto x:D[j]){
				if(vis[x]){
					fl=0;
					break;
				}
			}
			if(!fl)continue;
			cnt+=j;
			for(auto x:D[j])vis[x]=1;
		}
		ans=max(ans,cnt);
	}
	cout<<ans<<"\n";
	return 0;
}
/*

*/