#include<bits/stdc++.h>
#define int long long
#define INF 1000000000000000
using namespace std;

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

int v[504],dp[504][504];
///dp[i][j]=numarul minim de inmultiri daca adunam matricile din intervalul
///i,j(Ai,Ai+1,Ai+2,...,Aj)

signed main()
{
    int n,i,j,k,lg,dr;
    f>>n;
    for(i=1;i<=n+1;i++)
        f>>v[i];
    dp[1][1]=0;
    for(lg=2;lg<=n;lg++)
    {
        for(i=1;i<=n-lg+1;i++)
        {
            j=i+lg-1;
            dp[i][j]=INF;
            for(k=i;k<j;k++)
            {
                dp[i][j]=min(dp[i][j],dp[i][k]+dp[k+1][j]+v[i]*v[j+1]*v[k+1]);
            }
        }
    }
    g<<dp[1][n];
    return 0;
}