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@@ -0,0 +1,24 @@
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+from math import factorial
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+
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+def list_1():
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+ cnt = 0
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+ my_dict = {}
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+ my_list = list(map(int, input().split()))
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+ for i in my_list:
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+ if i not in my_dict.keys():
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+ my_dict.update({i:1})
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+ else:
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+ my_dict.update({i: my_dict.get(i) + 1})
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+ for i in my_dict.values():
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+ if i >= 3:
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+ cnt += int(factorial(i)/(2*factorial(i - 2)))
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+ elif i == 2:
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+ cnt += 1
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+
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+ print(my_list)
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+ print(my_dict)
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+ print("counter:", cnt)
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+
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+list_1()
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+
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+
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