24 lines
349 B
Python
24 lines
349 B
Python
import sys
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input = sys.stdin.readline
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N = int(input().strip())
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if N % 2 == 0 or N % 5 == 0:
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print(-1)
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sys.exit()
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visited = [False] * N
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r = 0
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k = 0
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while True:
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r = (r * 10 + 1) % N
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k += 1
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if r == 0:
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print(k)
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break
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if visited[r]:
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print(-1)
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break
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visited[r] = True
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