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#include <fstream>
#define INF 2000000005
#define DIM 505
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int N,D[DIM][DIM],v[DIM];
int main(){
fin>>N;
N++;
for(int i=1;i<=N;i++)
fin>>v[i];
for(int i=2;i<N;i++)
for(int j=1;i+j<=N;j++){
int d=i+j;
D[j][d]=INF;
for(int k=j+1;k<=d-1;k++)
D[j][d]=min(D[j][d],v[j]*v[k]*v[d]+D[j][k]+D[k][d]);
}
fout<<D[1][N]<<"\n";
fin.close();fout.close();
return 0;
}