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#include <iostream>
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#include <iomanip>
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#include <cmath>
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int main(int argc, char const *argv[])
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{
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unsigned int t;
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std::cin >> t;
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for (int i = 0; i < t; i++) {
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double a;
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std::cin >> a;
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std::cout << std::setprecision(9);
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std::cout << sqrt(a / M_PI)*2.0 << std::endl;
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}
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return 0;
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}
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