#include <bits/stdc++.h>
#define inf 1000000000
using namespace std;

ifstream fin ("podm.in");
ofstream fout ("podm.out");

int v[502],d[502][502],n;

int main()
{
    fin>>n;
    for(int i=1;i<=n+1;++i)fin>>v[i];
    for(int i=1;i<=n;++i)
        for(int j=i;j<=n;++j)
            d[i][j]=inf;
    for(int i=1;i<=n;++i)
        d[i][i]=0;
    for(int l=2;l<=n;++l)
        for(int i=1;i<=n-l+1;++i){
            int j=i+l-1;
            for(int k=i;k<j;++k)
                d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+v[i]*v[k+1]*v[j+1]);
        }
    fout<<d[1][n]<<endl;
    return 0;
}