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#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int v[502],n,i,j,l,k,d[502][502];
int main(){
fin>>n;
n++;
for(i=1;i<=n;i++)
fin>>v[i];
for(i=1;i<n;i++)
d[i][i+1]=0;
for(l=3;l<=n;l++){
for(i=1;i+l-1<=n;i++){
j=i+l-1;
d[i][j]=100000000;
for(k=i+1;k<j;k++)
d[i][j]=min(d[i][j],d[i][k]+d[k][j]+v[i]*v[j]*v[k]);
}
}
fout<<d[1][n];
return 0;
}