def fun1():
list1 = [1, 2, 3, 2, 3]
#list1=[1,1,1,1,1]
print(Counter(list1))
#print(type(Counter.value(2)))
#print(type(list1))
for i in range(5):
if (Counter.value(i) == 2):
no_of_pairs = no_of_pairs + 1
print(no_of_pairs)
