def sockMerchant(n, ar): pair = 0

set1 = list(set(ar))
for i in set1:
    if ar.count(i) % 2 == 0:
        pair = pair + ar.count(i)/2
    elif ar.count(i)%2 == 1:
        pair = pair+((ar.count(i)-1)/2)
return int(pair)