#include <fstream>

using namespace std;
FILE *f;
ofstream g("podm.out");
unsigned long long minim=2000000000000,m[510][510];
unsigned long long i,j,k,nr,n,d[510];
int main()
{
    f=fopen("podm.in","r");
    fscanf(f,"%d",&n);
    for(i=1;i<=n+1;i++)
        fscanf(f,"%d",&d[i]);
    for(nr=2;nr<=n;nr++)
    {
        for(i=1;i<=n-nr+1;i++)
        {
            j=i+nr-1;
            minim=2000000000000;
            for(k=i;k<j;k++)
                    minim=min(minim,m[i][k]+m[k+1][j]+d[i]*d[k+1]*d[j+1]);
            m[i][j]=minim;
        }
    }
    g<<m[1][n]<<'\n';
    return 0;
}