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#include <fstream>
#include <climits>
#define inf INT_MAX
using namespace std;
ifstream cin("podm.in");
ofstream cout("podm.out");
int n,i,d[505][505],v[505],j,l,k;
int main()
{
cin>>n;
for(i=0;i<=n;i++) cin>>v[i];
for(i=1;i<=n;i++) d[i][i]=0;
for(i=1;i<=n;i++) d[i][i+1]=v[i-1]*v[i]*v[i+1];
for(l=2;l<=n-1;l++)
{
for(i=1;i<=n-l;i++)
{
j=i+l;
d[i][j]=inf;
for(k=i;k<=j-1;k++)
{
d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+v[i-1]*v[k]*v[j]);
}
}
}
cout<<d[1][n];
return 0;
}