#include<stdio.h>
int n,x[500],a[500][500]; 

int main()
{
	int i,j,k;
	freopen("podm.in","r",stdin);
	freopen("podm.out","w",stdout);
	scanf("%d ",&n);
	for(i=1;i<=n+1;i++)
		scanf("%d ",&x[i]);
	a[n][1]=0;
	for(i=n-1;i>=1;i--)
		for(j=i+1;j<=n;j++)
		{
			a[i][j]=11000;
			for(k=i;k<j;k++)
				if(a[i][j]>(a[i][k]+a[k+1][j]+x[i]*x[k+1]*x[j+1])) 
					a[i][j]=a[i][k]+a[k+1][j]+x[i]*x[k+1]*x[j+1];
		}
		
	printf("%d ",a[1][n]);
}