import java.util.*;
public class Main {
public static void main(String[] args) {
int count=0;
int arr[]={2,8,3,5,7,4,1,2};
count = sum(arr);
System.out.println("Number of house -: " +count);  
  }
static int sum(int[] arr) {
int sum=0;
int r=7;
int unit=2;
int z = r*unit;
if(arr.length==0){
return -1;
 }
int count=0;
for(int i=0; i<arr.length;i++){
count++;
sum=sum+arr[i];
if(sum>=z)
return count;
  }
return 0;
 }
}