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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n;
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cin >> n;
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double s = 0;
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if (n % 2 == 0) {
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for (int i = 2; i <= n; i = i + 2)
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s += 1.0 / i;
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} else {
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for (int i = 1; i <= n; i = i + 2)
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s += 1.0 / i;
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}
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cout << s << endl;
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return 0;
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} |
