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#include <fstream>
#define NMAX 504
#define INF 18446744073709551614
using namespace std;
ifstream cin("podm.in");
ofstream cout("podm.out");
int n,i,j,k,d[NMAX],dif;
unsigned long long int pd[NMAX][NMAX];
int main()
{
cin>>n;
for(i=0; i<=n; i++)
{
cin>>d[i];
}
for(i=1; i<n; i++)
pd[i][i+1]=d[i-1]*d[i]*d[i+1];
for(dif=2; dif<n; dif++)
{
for(i=1; i<=n-dif; i++)
{
j=i+dif;
pd[i][j]=INF;
{
for(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]);
}
}
}
}
cout<<pd[1][n];
return 0;
}