#include <fstream>
#define nmax 502
#define inf 1e18
using namespace std;
ifstream cin("podm.in");
ofstream cout("podm.out");
int n,a[nmax];
long long dp[nmax][nmax];
int main()
{
    cin>>n;
    for(int i=1;i<=n+1;i++){
        cin>>a[i];
        if(i>2)
            dp[i-2][i]=1ll*a[i-2]*a[i-1]*a[i];
    }
    for(int l=2;l<=n;l++)
        for(int i=1;i+l-1<=n;i++){
            int j=i+l-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*a[i]*a[k+1]*a[j+1]);
        }
    cout<<dp[1][n];
    return 0;
}