#include<iostream.h>
#include<fstream.h>

using namespace std;
#define NM 512
#define INF 1000000000
ifstream in("podm.in");
ofstream out("podm.out");
long long O[NM][NM],D[NM],n;
int main(){
	int i,j,poz,d,k;
	in>>n;
	for(i=1;i<=n+1;i++) in>>D[i];
	for(d=1;d<=n-1;d++)
		for(poz=1;poz<=n-d;poz++){
			i=poz;
			j=d+poz;
			O[i][j]=INF;
	for(k=i;k<j;k++){
		long long min=O[i][k]+O[k+1][j]+D[i]*D[k+1]*D[j+1];
		if(min<O[i][j]) O[i][j]=min;}
}out<<O[1][n];
return 0;
}