using namespace std;
#define INF   100000000000000000LL
#include<fstream>
long long min(long long x,long long y)
{if(x>y) return y;return x;}
short d[550];
long long m[510][510];
int main()
{int i,j,h,k,n;
ifstream in("podm.in");
in>>n;
for(i=0;i<=n;i++)
	in>>d[i];
for(i=1;i<=n-1;i++)  
	m[i][i+1]=d[i-1]*d[i]*d[i+1];
for(j=2;j<=n-1;j++) 
	for(i=1;i<=n-j;i++)
	{h=i+j;
	m[i][h]=INF;
	for(k=i;k<=h-1;k++)
		m[i][h]=min(m[i][h],m[i][k]+m[k+1][h]+1LL*d[i-1]*d[k]*d[h]);
		}
ofstream out("podm.out");
out<<m[1][n]<<'\n';
out.close();
return 0;
}