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#include <fstream>
using namespace std;
int d[505],n;
ifstream fin("podm.in");
ofstream fout("podm.out");
void citire()
{
fin>>n;
for(int i=0;i<=n;i++)
fin>>d[i];
}
int m[505][505];
int main()
{
citire();
for(int i=1;i<=n;i++)
m[i][i]=0;
for(int x=1;x<=n;x++)
for(int i=1;i<=n;i++)
{
int j=i+x;
int Min=m[i][i]+m[i+1][j]+(d[i-1]*d[i]*d[j]);
for(int k=i+1;k<j;k++)
{
int s=m[i][k]+m[k+1][j]+(d[i-1]*d[k]*d[j]);
if(s<Min)
Min=s;
}
m[i][j]=Min;
}
fout<<m[1][n];
return 0;
}