2017 PacNW L Delayed work

/* 11/14/2017
*/

#include
#include
#include
using namespace std;

int main() {
long long k, p, x;
cin >> k >> p >> x;
int m = ceil(sqrt(k * p / x));
double ans = (double)k * p / m + x * m ;
cout << fixed << setprecision(3) << ans;
return 0;
}

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