#include <iostream> <math.h>

using namespace std;

const float e = 2.72;
const int a = 2;
const int b = 2;

int main() {
	int x, y, z;
	float result;
	cin >> x >> y >> z;

	result = cbrt((pow(x, 2) + (y / a)) / (pow(y, 2) + (z / b))) * pow(e, 2 * cos(x + (y * z)));
	cout << result;

}