#include <stdio.h>

#define FIN "nrtri.in"
#define FOUT "nrtri.out"
#define NMAX 1000


int n,i,j,x;
int v[NMAX];

int cautare(int p, int u)
{
  int m;
  m=(p+u)/2;
  while (p<=u){
      if ((v[m]<=v[i]+v[j] && v[m+1]>v[i]+v[j]) || (v[m]<=v[i]+v[j] && m==n-1))
		  return m;
	  else if (v[m]<=v[i]+v[j] && v[m+1]<=v[i]+v[j]) {
		  p=m+1;
		  m=(p+u)/2;
	  }
	  else {
		  u=m-1;
		  m=(p+u)/2;
		  }
  }
  return 0;
}


int main()
{

freopen(FIN,"rt",stdin);
freopen(FOUT,"wt",stdout);

scanf("%d", &n);

for (i=0;i<n;i++)
    scanf("%d", &v[i]);

for (i=0;i<n-2;++i)
    for (j=0;j<n-1;++j)
    {
	 x=cautare(1,n);
    }
printf("%d",x);

return 0;
}