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#include <fstream>
#define NMAX 504
using namespace std;
ifstream fin ("podm.in");
ofstream fout ("podm.out");
long long int v[NMAX];
long long int dp[NMAX][NMAX];
long long int n, i, j, k, l, mini;
int main()
{
fin>>n;
for (i=0; i<=n; i++)
fin>>v[i];
for (l=1; l<=n; l++)
for (i=1; i <= n-l+1; i++)
{
j=i+l-1;
if (i==j)
dp[i][j]=0;
else
{
mini=dp[i][i]+dp[i+1][j]+v[i-1]*v[i]*v[j];
for (k=i+1; k < j; k++)
mini=min(mini, dp[i][k]+dp[k+1][j]+v[i-1]*v[k]*v[j]);
dp[i][j]=mini;
}
}
fout<<dp[1][n]<<'\n';
return 0;
}