#include<fstream>
using namespace std;
ifstream in("podm.in");
ofstream out("podm.out");

#define INF 1000000000

int n, dim[510];
int a[512][512];

int main() {
	int i, j, d, m, k;
	in>>n;
	for(i = 1;i<=n+1;++i)
		in>>dim[i];
	for(d = 1; d<=n-1;++d)
		for(i = 1; i<=n-d;++i){
			j = d + i;
			a[i][j] = INF;
			for(k=i;k<j;++k){
				m=a[i][k] + a[k+1][j] + dim[i]*dim[k+1]*dim[j+1];
				if(m<a[i][j])
					a[i][j] = m;
			}
		}
	out<<a[1][n];
	return 0;
}