#include <bits/stdc++.h>
#define MAX 131072
#define INF 1000000007
#define MOD 31333
#define fx first
#define fy second

using namespace std;
const int NMAX = 505;

int N;
int v[NMAX];
long long dp[NMAX][NMAX], val;

int main(){

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

    scanf("%d", &N); N++;
    for(int i = 1; i <= N; i++)
        scanf("%d", &v[i]);

    for(int lg = 3; lg <= N; lg++)
        for(int i = 1; i <= N - lg + 1; i++){
            int j = i + lg - 1;
            val = 1e18;
            for(int k = i + 1; k < j; k++)
                val = min(1LL * val, dp[i][k] + dp[k][j] + 1LL * v[i] * v[k] * v[j]);
            dp[i][j] = val;
        }
    printf("%lld", dp[1][N]);
}