#include<stdio.h>
#define nmax 505
#define inf 100000000000000000LL

int n,i,j,k,nr;
long long m[nmax][nmax],v[nmax];



int main()
{
	freopen("podm.in", "r", stdin);
	freopen("podm.out", "w", stdout);
	scanf("%d", &n);
	for(i=1;i<=n+1;i++)
		scanf("%lld", &v[i]);
	for(nr=2;nr<=n;nr++)
		for(i=1;i<=n-nr+1;i++)
		{
			j=i+nr-1;
			m[i][j]=inf;
			for(k=i;k<j;k++)
				if(m[i][j]>m[i][k]+m[k+1][j]+v[i+1]*v[k+1]*v[j+1])
					m[i][j]=m[i][k]+m[k+1][j]+v[i]*v[k+1]*v[j+1];
		}	
	printf("%lld\n", m[1][n]);
	return 0;
}