#include <stdio.h>
#define MAXN 505
#define INF ((long long) 0x7fffffffffffffff)
#define MIN(a, b) (((a) < (b))?(a):(b))
using namespace std;

long long dp[MAXN][MAXN];
int n, v[MAXN];

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

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

    for(int dif = 1; dif < n; dif++)
        for(int i = 1; i + dif <= n; i++) {
            int j = i + dif;
            dp[i][j] = INF;
            for(int k = i; k < j; k++)
                dp[i][j] = MIN(dp[i][j], dp[i][k] + dp[k + 1][j] + 1LL * v[i - 1] * v[k] * v[j]);
        }

    printf("%lld\n", dp[1][n]);

    return 0;
}