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#include <iostream>
#include<fstream>
using namespace std;
int D,i,j,k,n;
long long d[1000],a[501][501];
int main()
{
ifstream f("podm.in");
f>>n;
for(i=0;i<=n;++i)f>>d[i];
for(i=1;i<n;++i)a[i][i+1]=d[i-1]*d[i]*d[i+1];
for(D=2;D<n;++D)
{
for(i=1;i<n-D+1;++i)
{
a[i][i+D]=a[i+1][D+i]+d[i-1]*d[i+D]*d[i];
for(k=i+1;k<i+D;++k)
{
a[i][i+D]=min(a[i][i+D], a[i][k]+a[k+1][D+i]+d[i-1]*d[k]*d[i+D]);
}
}
}
ofstream g("podm.out");g<<a[1][n];
// for(i=1;i<=n;++i)
// {
// for(j=1;j<=n;++j)
// cout<<a[i][j]<<" ";
// cout<<'\n';
// }
return 0;
}