#include <iostream>
#include <cstdio>
#include <climits>
#define N 505
#define inf LONG_LONG_MAX

using namespace std;

long long n,cost[N];
long long mat[N][N];

void initializare()
{
    for(long long i = 1 ; i <= n ; ++i)
    {
        for(long long j = 1 ; j <= n ; ++j)
        {
            if(i == j)
            {
                continue;
            }
            mat[i][j] = inf;
        }
    }
}

void prelucrare()
{
    for(long long l = 1 ; l < n ; ++l)
    {
        for(long long i = 1 ; i <= (n - l) ; ++i)
        {
            long long j = i + l;

            for(long long k = i ; k < j ; ++k)
            {
                long long tmp = mat[i][k] + mat[k + 1][j] + cost[i - 1] * cost[k] * cost[j];

                if(tmp < mat[i][j])
                {
                    mat[i][j] = tmp;
                }
            }
        }
    }
}

void citire()
{
    scanf("%lld\n",&n);

    for(long long i = 0 ; i <= n ; ++i)
    {
        scanf("%lld ",&cost[i]);
    }

    initializare();

    prelucrare();

    printf("%lld", mat[1][n]);
}

int main()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);

    citire();

    return 0;
}