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#include <bits/stdc++.h>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n,d[502],dp[502][502],vmin,z,i,j;
int main()
{
fin>>n;
for(int i=1;i<=n+1;i++)
fin>>d[i];
for(int i=1;i<=n-1;i++)
dp[i][i+1]=d[i]*d[i+1]*d[i+2];
for(int di=3;di<=n;di++)
for(i=1, j=di;j<=n;i++,j++)
{
vmin=9999999;
for(int k=i;k<j;k++)
{
z=dp[i][k]+dp[k+1][j]+d[i]*d[k+1]*d[j+1];
if(z<vmin)
vmin=z;
}
}
fout<<vmin;
return 0;
}