#include <fstream>
#define inf 1000000000000
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long n,i,j,k,l,d[505][505],a[505],y,minim;
int main()
{
    f>>n;
    for(i=1;i<=n+1;i++)
        f>>a[i];
    for(l=1;l<n;l++){
        for(i=1;i+l<=n;i++){
            j=i+l;
            minim=inf;
            for(k=i;k<j;k++){
                y=d[i][k]+d[k+i][j]+a[i]*a[k+1]*a[j+1];
                if(y<minim)
                    minim=y;
            }
            d[i][j]=minim;
        }
    }
         g<<d[1][n];
    return 0;
}