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#include <fstream>
#define VAL 505
#define INF 1000000000000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int N, i, j, k;
int v[VAL], d;
long long dp[VAL][VAL], mn;
int main()
{
fin >> N;
for (i=0; i<=N; i++)
fin >> v[i];
for (d=0; d<N; d++)
{
for (i=1; i<=N-d; i++)
{
if (d==0)
dp[i][i]=0;
if (d==1)
dp[i][i+1]=1LL*v[i-1]*v[i]*v[i+1];
if (d>1)
{
mn=INF;
j=i+d;
for (k=i; k<j; k++)
mn=min(mn, dp[i][k]+dp[k+1][j]+1LL*v[i-1]*v[k]*v[j]);
dp[i][j]=mn;
}
}
}
fout << dp[1][N] << '\n';
fin.close();
fout.close();
return 0;
}