18 lines
263 B
Python
18 lines
263 B
Python
import sys
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import math
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input = sys.stdin.readline
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N = int(input())
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result = N
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for i in range(2, int(math.sqrt(N))+1):
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if (N%i==0):
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result -= result / i
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while (N%i==0):
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N /= i
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if N>1:
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result -= result / i
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print(int(result)) |