#include <bits/stdc++.h>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long const inf=1e16;
long long n,i,j,k,a[505],dp[505][505],mi;
int main()
{
    f>>n;
    for(i=0;i<=n;++i) f>>a[i];
    for(i=1;i<=n;++i)
        for(j=1;j<=n;++j) dp[i][j]=inf;
    for(i=1;i<n;++i){
        dp[i][i+1]=a[i-1]*a[i]*a[i+1];
        dp[i][i]=0;
    }
    dp[n][n]=0;
    for(i=1;i<=n;++i)
        for(j=i+1;j<=n;++j)
            for(k=i;k<j;++k){
                dp[i][j]=min(dp[i][k]+dp[k+1][j]+a[i-1]*a[k]*a[j] , dp[i][j]);
            }
    g<<dp[1][n];
    return 0;
}