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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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//cin读入优化
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std::ios::sync_with_stdio(false);
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double r;
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cin >> r;
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//C语言版本保留两位小数
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//printf("%.2lf\n", 4 * 3.14 * r * r * r / 3);
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//C++版本保留两位小数
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cout << fixed << setprecision(2) << 4 * 3.14 * r * r * r / 3 << endl;
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return 0;
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} |
