import java.util.*;
class Main{
    public static void main (String[] args) {
        int n=5;
        int [] arr={2,1,1,5,8};
        int i=0;
        int k=4;
        int count=0;
        int sum=0;
        //Arrays.sort(arr);
        for(int j=0;j<n;j++){
            sum+=arr[j];
            while(sum>=k){
                count+=(n-j);
                sum-=arr[i];
                i++;
            }
 
 
        }
        System.out.println(count);
    }
}

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