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#include <fstream>
#define inf 2000000000
using namespace std;
int d[505], dp[505][505],n;
ifstream fin("podm.in");
ofstream fout("podm.out");
int main()
{
fin>>n;
for(int i=0;i<=n;i++)
fin>>d[i];
for(int i=1;i<n;i++)
dp[i][i+1]=d[i]*d[i-1]*d[i+1];
for(int l=3;l<=n;l++)
for(int i=1;i<=n-l+1;i++){
int j=i+l-1;
dp[i][j]=inf;
for(int k=i;k<j;k++)
dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j]+d[i-1]*d[k]*d[j]);
}
fout<<dp[1][n];
return 0;
}