#pragma GCC optimize("O3")
#pragma GCC optimize(2)
#pragma GCC optimize(3)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse")
#pragma GCC optimize("-fgcse-lm")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-ftree-pre")
#pragma GCC optimize("-ftree-vrp")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-falign-jumps")
#pragma GCC optimize("-falign-loops")	
#pragma GCC optimize("-falign-labels")
#pragma GCC optimize("-fdevirtualize")
#pragma GCC optimize("-fcaller-saves")
#pragma GCC optimize("-fcrossjumping") 
#pragma GCC optimize("-fthread-jumps")
#pragma GCC optimize("-funroll-loops")
#pragma GCC optimize("-freorder-blocks")
#pragma GCC optimize("-fschedule-insns")
#pragma GCC optimize("inline-functions")
#pragma GCC optimize("-ftree-tail-merge")
#pragma GCC optimize("-fschedule-insns2")
#pragma GCC optimize("-fstrict-aliasing")
#pragma GCC optimize("-falign-functions")
#pragma GCC optimize("-fcse-follow-jumps")
#pragma GCC optimize("-fsched-interblock")
#pragma GCC optimize("-fpartial-inlining")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("-freorder-functions")
#pragma GCC optimize("-findirect-inlining")
#pragma GCC optimize("-fhoist-adjacent-loads")
#pragma GCC optimize("-frerun-cse-after-loop")
#pragma GCC optimize("inline-small-functions")
#pragma GCC optimize("-finline-small-functions")
#pragma GCC optimize("-ftree-switch-conversion")
#pragma GCC optimize("-foptimize-sibling-calls")
#pragma GCC optimize("-fexpensive-optimizations")
#pragma GCC optimize("inline-functions-called-once")
#pragma GCC optimize("-fdelete-null-pointer-checks")
#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,fma") 
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") 
//#pragma GCC optimization ("unroll-loops")

#include <bits/stdc++.h>
 
using namespace std;

vector <int> prime;

void eratos()
{
	bool isprime[1263];

	memset(isprime,true,sizeof(isprime));

	for(int i=2;i<1263;i++)
	{
		if(isprime[i])
		{
			prime.push_back(i);
			for(int j=2*i;j<1263;j+=i)
			{
				isprime[j] = false;
			}
		}
	}
}

int dp[2][1<<12];
int arr[1263];
int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	eratos();

	int n;

	cin >> n;

	memset(dp,-1,sizeof(dp));
	memset(arr,-1,sizeof(arr));

	dp[1][0] = 0;

	for(int i=0;i<prime.size();i++)
	{
		if(prime[i] > 37) break;
		arr[prime[i]] = i;
	}

	for(int i=2;i<=n;i++)
	{
		memcpy(dp[0],dp[1],sizeof(dp[1]));
		memset(dp[1],-1,sizeof(dp[1]));

		int bitmask = 0;
		for(int j=0;j<prime.size();j++)
		{
			if(prime[j] > i) break;
			if(i%prime[j]==0)
			{
				if(arr[prime[j]]!=-1)
				{
					bitmask += (1<<arr[prime[j]]);
				}
			}
		}

		for(int j=0;j<(1<<12);j++)
		{
			if(dp[0][j]==-1) continue;
			dp[1][j] = max(dp[1][j],dp[0][j]);
			if((j&bitmask)==0)
			{
				dp[1][j|bitmask] = max(dp[1][j|bitmask],dp[0][j] + i);
			}
		}
	}

	int res = 0;

	for(int i=0;i<(1<<12);i++) res = max(res,dp[1][i]);

	cout << res << '\n';
	
	return 0;
}