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3 5 9#include <iostream>
#include <fstream>
using namespace std;
 
const char iname[] = "podm.in";
const char oname[] = "podm.out";
 
#define MAXN  505
#define Min(a, b) ((a) < (b) ? (a) : (b))
#define FOR(i, a, b)  for (int i = (a); i <= (b); ++ i)
#define INF   100000000000000000LL
 
typedef long long i64;
 
i64 bst[MAXN][MAXN], d[MAXN];   int n;
 
int main(void)
{
    ifstream in(iname);
    in >> n;
    FOR (i, 0, n)  in >> d[i];
    in.close();
 
    ofstream out(oname);
    FOR (i, 1, n)  bst[i][i] = 0;
    FOR (i, 1, n - 1)  bst[i][i + 1] = d[i - 1] * d[i] * d[i + 1];
    FOR (w, 2, n - 1) FOR (i, 1, n - w) {
        int j = i + w;
        bst[i][j] = INF;
        FOR (k, i, j - 1)
            bst[i][j] = Min(bst[i][j], bst[i][k] + bst[k + 1][j] + d[i - 1] * d[k] * d[j]);
    }
    out << bst[1][n];
    out.close();
    return 0;
}
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