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#include <fstream>
#include <iostream>
using namespace std;
int main()
{
int n,m[500][500];
ifstream fin ("podm.in");
ofstream fout ("podm.out");
fin>>n;
int v[n+1];
for (int i=1; i<=n+1; ++i)
{
fin>>v[i];
}
for(int i=1; i<=n; ++i)
{
for(int j=1; j<=n; ++j)
{
if(j+i>n)continue;
if(i==1)
{
m[j][j+i]=v[j]*v[j+1]*v[j+2];
}
else
{
for(int k=j; k<j+i; ++k)
{
if(m[j][j+i]==0)m[j][j+i]=m[j][k]+m[k+1][j+i]+v[j]*v[k+1]*v[j+i+1];
else m[j][j+i]=min(m[j][k]+m[k+1][j+i]+v[j]*v[k+1]*v[j+i+1],m[j][j+i]);
}
}
}
}
fout<<m[1][n];
}