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#include <fstream>
#include <limits.h>
#define INF LONG_LONG_MAX
using namespace std;
ifstream fin ("podm.in");
ofstream fout("podm.out");
long long n,i,j,k,l,v[505],D[505][505];
int main(){
fin>>n;n++;
for (i=1;i<=n;i++)
fin>>v[i];
/*for (i=1;i<n;i++)
D[i][i+1]=0;*/
for (l=3;l<=n;l++)
for (i=1;i+l-1<=n;i++){
j=i+l-1;
D[i][j]=INF;
for (k=i+1;k<j;k++)
D[i][j]=min(D[i][j],D[i][k]+D[k][j]+v[i]*v[k]*v[j]);
}
fout<<D[1][n];
fin.close();
fout.close();
return 0;
}