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#include <bits/stdc++.h>
using namespace std;
ifstream in("nrtri.in");
ofstream out("nrtri.out");
int v[800];
void ordonare(int n,int v[])
{
int aux;
for(int i=1;i<n;i++)
for(int j=i+1;j<=n;j++)
if(v[i]>v[j])
{
aux=v[i];
v[i]=v[j];
v[j]=aux;
}
}
int main()
{
int n,i,t,nr=0;
in>>n;
for(t=1;t<=n;t++)
{
in>>v[t];
}
ordonare(n,v);
for(i=1;i<=n;i++)
if(i+2<=n)
nr++;
out<<nr;
return 0;
}