/* 
 * File:   main.cpp
 * Author: virtualdemon
 *
 * Created on January 20, 2010, 2:02 PM
 */
#include <vector>
#include <fstream>
#include <iterator>
#define NMax 510

/*
 *
 */
using namespace std;
typedef unsigned long long llu;
vector< llu > d;
llu M[NMax][NMax];
const llu inf=(llu)1<<60;
inline llu min( llu x, llu y )
{
    return y^( (x^y) & -(x<y) );
}
int main()
{llu n, i, j, k;
    ifstream in("podm.in");
    in>>n;
    copy( istream_iterator<llu>(in), istream_iterator<llu>(), back_inserter(d) );
    for( i=n-1; i > 0; --i )
    {
        M[i][i]=0;
        M[i][i+1]=d[i-1]*d[i]*d[i+1];
        for( j=i+2; j <= n; ++j )
        {
            M[i][j]=inf;
            for( k=i; k < j; ++k )
                M[i][j]=min( M[i][j], M[i][k]+M[k+1][j]+d[i-1]*d[k]*d[j] );
        }
    }
    ofstream out("podm.out");
    out<<M[1][n];
    return 0;
}