#include <cstdio>

int n;
long long a[505], b[505][505];

void Citire()
{
    FILE *F = fopen("podm.in", "r");
    fscanf(F, "%d", &n);
    for (int i = 0; i <= n; ++i)
        fscanf(F, "%lld", &a[i]);
    for (int i = 0; i <= 504; ++i)
        for (int j = 0; j <= 504; ++j)
            b[i][j] = 0x3f3f3f3f;
    fclose(F);
}

long long Min(long long a, long long b)
{
    if (a < b)
        return a;
    return b;
}

void Matrice()
{
    int i, j, k, tz;
    for (i = 1; i <= n; ++i)
        b[i][i] = 0;
    for (tz = 2; tz <= n; ++tz)
        for (i = 1, j = tz; j <= n ; ++i, ++j)
            for(k = i; k <= j; ++k)
                b[i][j] = Min(b[i][j], b[i][k] + b[k + 1][j] + a[i - 1] * a[j] * a[k]);
}

void Afisare()
{
    FILE *G = fopen("podm.out", "w");
    fprintf(G, "%lld", b[1][n]);
    fclose(G);
}

int main()
{
    Citire();
    Matrice();
    Afisare();
    return 0;
}