#include<iostream.h>
#include<fstream.h>
#define NM 51//2
#define INF 10000//00000000LL
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;
}