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#include <iostream>
#include <fstream>
using namespace std;
int main()
{ int n,i,v[100],j,k,nr=0;
ifstream f("adunare.in.txt");
ofstream g("adunare.out.txt");
f>>n;
for(i=1;i<=n;i++)
f>>v[i];
for(i=1;i<=n-2;i++)
for(j=i+1;j<=n-1;j++)
for(k=j+1;k<=n;k++)
if(v[i]+v[j]>v[k])
if(v[i]+v[k]>v[j])
if(v[j]+v[k]>v[i])
nr++;
g<<nr;
f.close();
g.close();
return 0;
}