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#include <fstream>
#include <climits>
#define vmax 503
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n;
long long d[vmax];
long long nrmin[vmax][vmax];
void citire();
void calcul();
void afisare();
int main()
{
citire();
calcul();
afisare();
return 0;
}
void citire()
{
fin>>n;
for (int i=0; i<=n; i++)
fin>>d[i];
}
void calcul()
{
for(int i=1; i<n; i++)
nrmin[i][i + 1] = d[i - 1] * d[i] * d[i + 1];
for (int k=2; k<n; k++)
for (int i= 1; i<=n-k; i++)
{
int j=i+k;
nrmin[i][j] = LONG_LONG_MAX;
for (int p= i; p<= j - 1; p++)
{
long long suma= nrmin[i][p] + nrmin[p + 1][j] + d[i - 1] * d[p] * d[j];
if (suma<nrmin[i][j])
nrmin[i][j]=suma;
}
}
}
void afisare()
{
fout<<nrmin[1][n];
}