/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
  int diff = 0;
  int count = 0;
  int arr[] = {1,2,3,1,2,1,1};
      Arrays.sort(arr);
  int k =5;
  int n = arr.length;
     for(int i = 0,j=0; j<n;j++){
     		diff = arr[j] - arr[i]; 
     		while(diff > k){
     			diff -= arr[i];
     			i++;
     		}
     		count+= (j-i+1);
     	}
 
          	System.out.println(count - n); // For the pairs where i==j
 
	}
}

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