function hit = oracle(x)
    
    % global oracle ussage counter0
    global call_to_oracle
 
    % load data
    M = dlmread('20_0.1.txt',',');
    rad = M(1,1);
    z =  M(2:size(M,1),:);
  
    N = size(z,1);
    s = z - repmat(x,N,1);
    norms = sqrt(sum(s.^2,2));
    hit = logical(sum(norms < rad));
    
    call_to_oracle = call_to_oracle+1;
    
end

