#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n,a[501];
unsigned long long dp[501][501];
int main()
{
    fin>>n;
    for(int i=0;i<=n;++i){
        fin>>a[i];///Mi are dimensiunea a[i-1]*a[i]
    }
    /*for(int i=2;i<=n+1;++i){
        dp[i][i+1]=a[i-1]*a[i]*a[i+1];///Mi*Mi+1
    }*/
    for(int lungime=2;lungime<=n;++lungime){
        for(int i=1;i<=n-lungime+1;++i){
            unsigned long long val;
            int dr = i + lungime -1;
            dp[i][dr]=1e18;
            for(int j=1;j<dr;++j){
                val=dp[i][j]+dp[j+1][dr]+a[i-1]*a[j]*a[dr];
                if(dp[i][dr]>val)
                    dp[i][dr]=val;
            }
        }
    }
    fout<<dp[1][n];
    return 0;
}