#include <fstream>
#define minim(a,b) (a<b?a:b) 
#define inf (1LL<<62)
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long n,a[501];
long long D[501][501];

int main(void){
	register int i,j,d,k;
	
	f>>n;
	for(i=1;i<=n+1;i++)
		f>>a[i];
	
	for(i=1;i<=n-1;i++)
		D[i][i+1]=a[i]*a[i+1]*a[i+2];
	for(d=3;d<=n;d++){
		for(i=1,j=d;j<=n;i++,j++){
			D[i][j]=inf;
			for(k=i;k<j;k++){
				D[i][j]=minim(D[i][j],D[i][k]+D[k+1][j]+a[i]*a[k+1]*a[j+1]);
			}
		}
	}
	g<<D[1][n];
	return 0;
}