17 lines
392 B
Python
17 lines
392 B
Python
'''****** Задание ********
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*Хайпанём немножечко!
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'''
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n = int(input())
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num_false_h = -1
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pre_h = 0
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for i in range(n):
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block = int(input())
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h = block % 256
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m = block // 256 ** 2
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r = (block // 256) % 256
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true_h = (37 * (m + r + pre_h)) % 256
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pre_h = h
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if true_h >= 100 or true_h != h:
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num_false_h = i
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break
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print(num_false_h) |