#include<fstream>
using namespace std;
ifstream F("podm.in");
ofstream G("podm.out");
long long i,j,k,a[501][501],n,d[501];
int main()
{
    for(F>>n;i<=n;F>>d[i++]);
    for(i=1;i<n;a[i][i+1]=d[i-1]*d[i]*d[i+1],++i);
    for(k=2;k<n;++k)
        for(i=1;i<=n-k;++i)
            for(a[i][i+k]=1e18,j=i;j<=i+k;a[i][i+k]=min(a[i][i+k],a[i][j]+a[j+1][i+k]+d[i-1]*d[j]*d[i+k]),++j);
    return G<<a[1][n],0;
}