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#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long d[510][510],n,v[510];
int main(){
fin>>n;
n++;
for(int i=1; i<=n; i++){
fin>>v[i];
}
for(int l=2;l<=n;l++){
for(int i=1; i+l-1<=n;i++){
int j=i+l;
d[i][j]=2000000000000000;
for(int 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];
}