#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=10010;
const int mod=998244353;
const int pr[]={2,3,5,7,11,13,17,19,23,29,31,37};
int n;
int ans;
int S[N];
vector<int>sy[N];
int f[1<<12],g[1<<12];
signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	// freopen("score.in","r",stdin);
	// freopen("score.out","w",stdout);
	cin>>n;
	for(int i=2;i<=n;i++){
		int t=i;
		for(int j=0;j<12;j++){
			if(t%pr[j]==0){
				S[i]|=(1ll<<j);
				while(t%pr[j]==0)t/=pr[j];
			}
		}
		sy[t].push_back(i);
	}
	for(auto x:sy[1]){
		for(int i=(1ll<<12)-1;i>=0;i--){
			if(S[x]&i)continue;
			f[S[x]|i]=max(f[S[x]|i],f[i]+x);
		}
	}
	for(int _=2;_<=n;_++){
		for(int i=0;i<(1ll<<12);i++)g[i]=f[i];
		for(auto x:sy[_]){
			for(int i=(1ll<<12)-1;i>=0;i--){
				if(S[x]&i)continue;
				f[S[x]|i]=max(f[S[x]|i],g[i]+x);
			}
		}
	}
	for(int i=0;i<(1ll<<12);i++)ans=max(ans,f[i]);
	cout<<ans<<"\n";
	return 0;
}
/*

*/