#include <iostream>
#include <fstream>

using namespace std;

const int Nmax = 505;
const int   oo = 0x3f3f3f3f;

int N;
int A[Nmax];
unsigned long long M[Nmax][Nmax];

void read()
{
    freopen("podm.in", "r", stdin);

    scanf("%d", &N);

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

    fclose( stdin );
}

void DP()
{
    for ( int n = 2; n <= N; ++n )
            for ( int i = 1; i <= N - n + 1; ++i )
            {
                int j = i + n - 1;

                M[i][j] = oo;

                for ( int k = i; k < j; ++k )
                        M[i][j] = min ( M[i][j], M[i][k] + M[k + 1][j] + 1LL * A[i - 1] * A[k] * A[j] );
            }
}

void print()
{
    freopen("podm.out", "w", stdout);

    printf("%I64d\n", M[1][N]);

    fclose( stdout );
}

int main()
{
    read();
    DP();
    print();

    return 0;
}