#include <cstdio>
#define min(a,b) ((a<b)?a:b)


using namespace std;

int n;
long long d[510], m[510][510];

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

void parantezare(){int j;
    for(int i=1;i<n;i++)
        m[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(int x=2;x<n;x++)
        for(int i=1;i<n-x+1;i++){
            j=x+i;
            m[i][j]=m[i][i]+m[i][j]+d[i-1]*d[i]*d[j];
            for(int k=i+1;k<j;k++)
                m[i][j]=min(m[i][j] , m[i][k]+m[k+1][j]+d[i-1]*d[k]*d[j]);
        }
    printf("%lld\n",m[1][n]);

}

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