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#include <cstdio>
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#include <cmath>
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int main()
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{
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long long n, sum = 0;
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scanf("%lld", &n);
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long long lmt = sqrt(n) + 5;
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for (long long i = 2; i <= lmt; i++)
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if (n % i == 0)
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{
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sum = (n - i) / 2;
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break;
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}
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printf("%lld", sum + 1);
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return 0;
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} |
