def pickingNumbers(a):
    a.sort()
    ml = 0
    for i in range(len(a)):
        la = [a[i]]
        for j in range(i+1, len(a)):
            if abs(a[i]-a[j]) <= 1:
                la.append(a[j])
        
        print(la)
        if len(la) > ml:
            ml = len(la) 
            
    return ml