#include <bits/stdc++.h>

using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n, i, a[502], l, j, k;
long long dp[502][502];
signed main()
{
    fin>>n;
    for(i=1;i<n+2;i++)
        fin>>a[i];
    for(i=1;i<n;i++)
        dp[i][i+1]=a[i]*a[i+1]*a[i+2];
    for(l=3;l<=n;l++)
    {
        for(i=1;i<=n-l+1;i++)
        {
            j=i+l-1;
            dp[i][j]=1000000000000000000;
            for(k=i;k<j;k++)
                dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j]+a[i]*a[k+1]*a[j+1]);
        }
    }
    fout << dp[1][n];
    return 0;
}