#include <cstdio>
#include <algorithm>
#define Lmax 505
#define INF 500000000000000005LL
using namespace std;

FILE *fin=freopen("podm.in","r",stdin);
FILE *fout=freopen("podm.out","w",stdout);

long long m[Lmax][Lmax],d[Lmax];
int n;

void read()
{
    scanf("%d",&n);
    for(int i=0;i<=n;i++)
        scanf("%d",&d[i]);
}

void solve()
{
    for(int i=1;i<n;i++)
            m[i][i+1]=d[i]*d[i+1]*d[i-1];
    for(int k=2;k<=n-1;k++)
        for(int i=1;i<=n-k;i++)
        {
            int j=i+k;
            m[i][j]=INF;
            for(int l=i;l<j;l++)
                m[i][j]=min(m[i][j],m[i][l]+m[l+1][j]+d[i-1]*d[l]*d[j]);
        }
}

void print()
{
    printf("%lld\n",m[1][n]);
}

int main()
{
    read();
    solve();
    print();
return 0;
}