#include <fstream>
#define NMax 501
#define INF 1LL<<63-1;
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int n, v[NMax], l, i, j, k;
long long d[NMax][NMax];
int main()
{
    f>>n;
    for (i=0; i<=n; i++)
        f>>v[i];
    for (l=2; l<=n; l++) {
        for (i=1; i<=n-l+1; i++) {
            j=i+l-1;
            d[i][j]=INF;
            for (k=i; k<j; k++)
                d[i][j]=min(d[i][j], d[i][k] + d[k+1][j] + 1LL*v[i-1]*v[k]*v[j]);
        }
    }
    g<<d[1][n];
    return 0;
}