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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, k;
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int Asum = 0, Bsum;
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cin >> n >> k;
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for (int i = k; i <= n; i += k) Asum += i;
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Bsum = (1 + n) * n / 2 - Asum;
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printf("%.1lf ", double(Asum) / (n / k));
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printf("%.1lf ", double(Bsum) / (n - n / k));
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return 0;
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} |
