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#include <fstream>
#include <climits>
const int NMAX = 500;
long long int dp[1+NMAX][1+NMAX];
long long int v[2+NMAX];
using namespace std;
int main()
{
ifstream f("podm.in");
ofstream g("podm.out");
int n;
f>>n;
for(int i=1;i<=n+1;i++)
{
f>>v[i];
}
for(int l=2;l<=n;l++)
{
for(int i=1;i<=n;i++)
{
dp[l][i]=LLONG_MAX;
}
}
for(int l=2;l<=n;l++)
{
for(int i=1;i<=n-l+1;i++)
{
for(int k=i;k<=i+l-1;k++)
{
d[l][i] = min(d[l][i],d[k-i+1][i] + v[i]*v[i+l]*v[k+1] + d[i+l-1-k][k+1]);
}
}
}
g<<dp[n][1];
return 0;
}