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#include <fstream>
#define INF 1000000000002
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int n,i,L[505],C[505],x,j,k;
long long Q[505][505],mi;
int main()
{
f>>n;
for(i=1;i<=n+1;i++)
{
f>>x;
L[i]=x;
C[i-1]=x;
}
for(i=n-1;i>=1;i--)
{
for(j=i+1;j<=n;j++)
{
mi=INF;
for(k=i;k<j;k++)
if(Q[i][k]+Q[k+1][j]+L[i]*C[k]*C[j]<mi)
mi=Q[i][k]+Q[k+1][j]+L[i]*C[k]*C[j];
Q[i][j]=mi;
}
}
g<<Q[1][n];
return 0;
}