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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long v[505],d[505][505],n,i,j,k;
int main()
{
f>>n;
for(i=0;i<=n;i++)
f>>v[i];
for(i=1;i<=n;i++)
d[i][i]=0;
for(i=1;i<n;i++)
d[i][i+1]=v[i-1]*v[i]*v[i+1];
for(i=2;i<n;i++)
for(j=1;j<=n-i;j++)
{
d[j][i+j]=100000000000000000;
for(k=j;k<i+j-1;k++)
d[j][i+j]=min(d[j][i+j],d[j][k]+d[k+1][i+j]+v[j-1]*v[k]*v[i+j]);
}
g<<d[1][n];
return 0;
}