#include <fstream>
#include <iostream>
using namespace std;

ifstream in("podm.in");
ofstream out("podm.out");

int a[510],n,dp[510][510];

int main()
{
    in>>n;

    for(int i=1;i<=n+1;i++)
        in>>a[i];
    for(int i=n+1;i>=1;i--){
        for(int j=1;j<=n+1;j++){
            long long mini=dp[i][j]+dp[i+1][j]+a[i]*a[i+1]*a[j+1];
            for(int k=i;k<j;k++)
                if(mini>dp[i][k]+dp[k+1][j]+a[i]*a[k+1]*a[j+1])
                    mini=dp[i][k]+dp[k+1][j]+a[i]*a[k+1]*a[j+1];
            if(i!=j)
                dp[i][j]=mini;
            else
                dp[i][j]=0;
        }
    }
    out<<dp[1][n];
    return 0;
}