#include <fstream>
#include <cstdlib>
#define N_MAX 511
#define oo 9999999999999999LL

using namespace std;
int v[N_MAX];
unsigned long long int C[N_MAX][N_MAX];
int main( void )
{
	int N, i, j, k;
	ifstream in( "podm.in" );
	in>>N;
	for( i=0; i <= N; ++i )
		in>>v[i];
	for( i=N-1;  i; --i )
	{
		C[i][i+1]=1LL*v[i-1]*v[i]*v[i+1];
		for( j=i+2; j <= N; ++j )
		{
			C[i][j]=oo;
			for( k=i; k < j; ++k )
				C[i][j]=min( C[i][j], C[i][k]+C[k+1][j]+1LL*v[i-1]*v[j]*v[k] );
		}
	}
	ofstream out( "podm.out" );
	out<<C[1][N]<<'\n';
	return EXIT_SUCCESS;
}