#include <fstream>

using namespace std;

ifstream f("podm.in");
ofstream g("podm.out");

int n;
long long d[506], dp[506][506];

int main()
{
    f >> n;
    for(int i = 0; i <= n; i++)
        f >> d[i];
    for(int len = 2; len <= n; len++)
        for(int i = 1, j = len; j <= n; i++, j++)
        {
            dp[i][j] = 0x3F3F3F3F;
            for(int k = i; k < j; k++)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + d[i-1]*d[k]*d[j]);
        }
    g << dp[1][n];
    return 0;
}