#include <fstream>
using namespace std;

ifstream fin ("podm.in");
ofstream fout ("podm.out");


const int Dim = 501;
long long M[Dim][Dim],n,D[Dim];

int main() {
	
	fin >> n;
	++n;;
	for ( int i = 1; i <= n+1; ++i)  {
		fin >> D[i];
	}
	for ( int i = 1; i <= n; ++i)
		for ( int j= 2+i; j <= n; ++j)
			M[i][j] = 1LL << 58;
	M[1][1] = 1;
	for ( int l = 3; l <= n; ++l) 
		for ( int i = 1; i <= n-l+1; ++i) {
			
			int j = i + l - 1;
			for ( int k = i + 1; k < j; ++k) 
				M[i][j] = min(M[i][j],M[i][k] + M[k][j] + D[i] *D[k] * D[j]);
		} 
	fout << M[1][n];		
}