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#include <fstream>
#define INF 100000000000000000LL
#define NMAX 501
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long int n, i, j, dif;
long long pd[NMAX][NMAX], d[NMAX];
long long int cuts[NMAX][NMAX];
int main()
{
fin>>n;
for(i=0;i<=n;i++)
{ fin>>d[i];
pd[i][i]=0;
}
for(i=1;i<n;i++)
pd[i][i+1]=d[i-1]*d[i]*d[i+1];
for(dif=2;dif<=n-1;dif++)
for(i=1;i<=n-dif;i++)
{
j=i+dif;
pd[i][j]=INF;
for(int k=i;k<j;k++)
{
pd[i][j]=min(pd[i][j], pd[i][k]+pd[k+1][j]+d[i-1]*d[k]*d[j]);
}
}
fout<<pd[1][n];
return 0;
}