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HuangHai
2025-08-30 18:35:01 +08:00
commit 1f397eca87
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TangDou/LanQiaoBei/LanQiao11ShengSai/620LCcb3.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int main() {
int n = 0;
cin >> n;
printf("%.1lf", 1.0 * n * n / 4);
return 0;
}