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#include <iostream>
#include<fstream>
using namespace std;
int main()
{
int n,i,v[1001],ord=0,num=0,a;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
f>>n;
for(i=1; i<=n; i++)
f>>v[i];
for (i=1; i<=n; i++)
{
while(ord==0)
{
ord=1;
for(i=1; i<n; i++)
if (v[i]>v[i+1])
{
a=v[i];
v[i]=v[i+1];
v[i+1]=a;
ord=0;
}
}
}
for(i=1; i<=n; i++)
{
if(v[i]+v[i+1]>=v[i+2])
num++;
}
g<<num-2;
return 0;
}