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#include <fstream>
#define INF 10000000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int a[505][505],i,n,x,d[505],j,k;
int main()
{
fin>>n;
for(i=0;i<=n;i++)
fin>>d[i];
for(i=1;i<=n;i++)
a[i][i]=0;
for(i=1;i<=n-1;i++)
a[i][i+1]=d[i-1]*d[i]*d[i+1];
for(k=2;k<=n-1;k++)
for(i=1;i<=n-k;i++)
{
int j=i+k;
a[i][j]=INF;
for(x=i;x<=j-1;x++)
a[i][j]=min(a[i][j],a[i][x]+a[x+1][j]+d[i-1]*d[x]*d[j]);
}
fout<<a[1][n];
return 0;
}