15 lines
246 B
C++
15 lines
246 B
C++
// ac_1_3.cpp
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// Горбацевич Андрей
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#include <iostream>
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#include <cstdio>
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#include <clocale>
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#include <cmath>
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using namespace std;
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int main()
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{
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setlocale(LC_ALL, "russian");
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double a;
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cin >> a;
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cout << 2*a/9.81;
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}
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