#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("podm.in");
ofstream fout("podm.out");

int n;
long long dp[505][505], d[505];

void citire() {
    fin>>n;
    for (int i=0; i<=n; i++)
        fin>>d[i];
}

long long matrix() {
    for (int i=1; i<=n+1; i++)
        dp[i][i]=0;
    for (int dif=1; dif<=n-1; dif++)
        for (int i=1; i<=n-dif; i++) {
            int j=i+dif;
            dp[i][j]=dp[i][i]+dp[i+1][j]+d[i-1]*d[i]*d[j];
            for (int k=i+1; k<j; k++)
                dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j]+d[i-1]*d[k]*d[j]);
        }
    return dp[1][n];
}

int main() {
    citire();
    fout<<matrix();
    return 0;
}