#include <fstream>
#include <vector>
#include <algorithm>
#include <cassert>

using namespace std;

#define MOD 23456789
#define pb push_back

vector< int > V;
int N, x;
long long S, i;

int main() {
	ifstream fi( "algsort.in" );
	ofstream fo( "algsort.out" );

	fi >> N; V.pb( 0 );
	for( i = 1; i <= N; i++ ) {
		fi >> x;
		V.pb( x );
	}

	sort( V.begin(), V.end() );
	
	for( S = 0, i = 1; i <= N; i++ )
		S = ( S + i*V[i] ) % MOD;

	fo << S << '\n';

	fi.close(); fo.close();
	return 0;
}