#include <fstream>
#define INF 2000000000000000ll
using namespace std;
long long a[505][505], d[505];
int n, i, j, k, l;

int main () {
    ifstream fin ("podm.in");
    ofstream fout ("podm.out");
    fin>>n;
    for (i=1;i<=n+1;i++)
        fin>>d[i];

    for (l=2;l<=n;l++) {
        for (i=1;i<=n-l+1;i++) {
            j=i+l-1; a[i][j]=INF;
            for (k=i;k<j;k++) {
                a[i][j]=min(a[i][j], d[i]*d[k+1]*d[j+1]+a[i][k]+a[k+1][j]);
            }
        }
    }

    fout<<a[1][n];

    return 0;
}