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#include <iostream>
#include <fstream>
#include <limits.h>
using namespace std;
#define MAX 505
ifstream fin("podm.in");
ofstream fout("podm.out");
int n,a[MAX];
long long d[MAX][MAX];
int main()
{
fin>>n;
for(int i=0;i<=n;i++)
fin>>a[i];
for(int i=1;i<=n-1;i++)
d[i][i+1]=1LL*a[i-1]*a[i]*a[i+1];
for(int p=2;p<=n-1;p++)
{
for(int i=1;i<=n-p;i++)
{
int j=i+p;
d[i][j]=LONG_LONG_MAX;
for(int k=i;k<=j-1;k++)
d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+1LL*a[i-1]*a[k]*a[j]);
}
}
fout<<d[1][n];
fin.close();
fout.close();
return 0;
}