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#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int d[504][504],a[504],n,j;
int main()
{
fin>>n;
n++;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int len=3;len<=n;len++)
{
for(int i=1;i<=n-len+1;i++)
{
j=len+i-1;
d[i][j]=1000000000;
for(int m=i+1;m<j;m++)
{
d[i][j]=min(d[i][j],d[i][m]+d[m][j]+a[i]*a[m]*a[j]);
}
}
}
fout<<d[1][n];
return 0;
}