#include <cstdio>
#include <iostream>

using namespace std;

const int nmx = 503;
const int inf = 999999999999999;

int n;
long long v[nmx];
long long dp[nmx][nmx];

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

void initializare()
{
    for(int i = 0; i <= n; ++i)
        for(int j = 0; j <= n; ++j)
            dp[i][j] = inf;
    for(int i = 1; i <= n; ++i)
        dp[i][i] = 0;
    for(int i = 1; i < n; ++i)
        dp[i][i+1] = v[i-1]*v[i]*v[i+1];
}

void dinamica()
{
    for(int d = 2; d < n; ++d)
        for(int i = 1; i + d <= n; ++i)
            for(int k = i; k < i + d; ++k)
                dp[i][i+d] = min(dp[i][i+d], dp[i][k] + dp[k+1][i+d] + v[i-1] * v[k] * v[i+d]);
}

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

int main()
{
    freopen("podm.in", "r", stdin);
    freopen("podm.out", "w", stdout);
    citire();
    initializare();
    dinamica();
    afish();
    return 0;
}