attack.py

# cook your code here
import random
list=[]
bots=[]
duplicate = 0

for i in range(2000):

          r=random.randint(1,1000)
          if list.count(r) < 2: 
              list.append(r)
              if i % 10 == 0:
                  bots.append(r)
                  if bots.count(r) == 2: 
                      duplicate += 1

          else:
              i -= 1


print(duplicate)