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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int n,x,i,j,c=0,k;
ifstream f("nrtri.in");
f>>n;
int a[n];
for(i=0;i<n;i++)
f>>a[i];
f.close();
ofstream g("nrtri.out");
for(i=0;i<n;i++)
{for(j=i+1;j<n;j++)
{for(k=j+1;k<n;k++)
{if(a[i]+a[j]>=a[k])
{if(a[j]+a[k]>=a[i])
if(a[i]+a[k]>=a[j])
{
c++;
}
}
}
}
}
g<<c;
return 0;
}