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#include <iostream>
#include <fstream>
using namespace std;
#define INF 1000000000
#define MAXN 510
ifstream f("podm.in");
ofstream g("podm.out");
long long n,v[MAXN],a[MAXN][MAXN];
int main()
{
f>>n;
for(int i=0;i<=n;i++)
f>>v[i];
for(int i=1;i<n;i++)
a[i][i+1]=v[i-1]*v[i]*v[i+1];
for(int w=2;w<n;w++)
{
for(int i=1;i<=w;i++)
{
int j=i+w;
a[i][j]=INF;
for(int k=i;k<=j;k++)
{
a[i][j]=min(a[i][j],a[i][k]+a[k+1][j]+v[i-1]*v[k]*v[j]);
}
}
}
cout<<a[1][n];
return 0;
}