21 lines
480 B
Python
21 lines
480 B
Python
dlina = int(input())
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massiv = input().split()
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deystviy = 0
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for i in range(dlina):
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tempDeyst = 0
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idlapoiskaed = 0
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for kjkjjljdfg in range(dlina):
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if massiv[idlapoiskaed] == '1':
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break
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idlapoiskaed += 1
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if massiv[i] == "0":
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for j in range(i):
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if massiv[j] == "1":
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tempDeyst += 1
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deystviy += tempDeyst
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massiv[i], massiv[idlapoiskaed] = massiv[idlapoiskaed], massiv[i]
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print(deystviy)
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