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