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