#include <fstream>
#define nMax 504
#define INF 100000000000000000LL
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long dp[nMax][nMax];
int n, val[nMax];
int main()
{
    fin>>n;
    for(int i=0;i<=n;i++)
        fin>>val[i];
    for(int i=1;i<=n;i++)
        dp[i][i]=0;
    for(int i=1;i<n;i++)
        dp[i][i+1]=val[i-1]*val[i]*val[i+1];
    for(int len=3;len<=n;len++)
    {
        for(int i=1;i+len-1<=n;i++)
        {
            int j=i+len-1;
            dp[i][j]=INF;
            for(int k=i;k<=j;k++)
                dp[i][j]=min(dp[i][j], dp[i][k] + dp[k+1][j] + 1ll*val[i-1] * val[k] * val[j]);
        }
    }
    fout<<dp[1][n];
    return 0;
}