def pickingNumbers(a):
    s=[]
    c1,c2=0,0
    for i in range(len(a)):
        for j in range(len(a)):
            if a[i] in [a[j],a[j]-1]:
                c1+=1
            if a[i] in [a[j],a[j]+1]:
                c2+=1
        s.append(c1)
        s.append(c2)
        c1=0
        c2=0
    return max(s)