#include <iostream>
#include <cstdio>
using namespace std;

long long n,d[510];
long long cost[510][510];

void citire()
{
    scanf("%lld",&n);
    for (long long i=0; i<=n; i++)
        scanf("%lld",&d[i]);
}

void parantezare()
{
    for (long long l=1; l<n; l++)
        for (long long i=1; i<=n-l; i++)
            {
                long long j=l+i;
                cost[i][j]=((long long)1<<62);
                for (long long k=i; k<j; k++)
                    cost[i][j]=min(cost[i][j], cost[i][k]+cost[k+1][j]+d[i-1]*d[k]*d[j]);
            }
    printf("%lld",cost[1][n]);
}

void afisare()
{
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<=n; j++)
             printf("%lld ",cost[i][j]);
        printf("\n");
    }
}

int main()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);
    citire();
    parantezare();
    ///afisare();
    return 0;
}