#include <cmath>
#include <iostream>

using namespace std;

template <typename T>
const T PI = std::acos(static_cast<T>(-1));

template <typename T>
const T ONE_EIGHTY = 180;

template <typename T>
const T DEG_TO_RAD = PI<T> / ONE_EIGHTY<T>;

int main() {
  cout << DEG_TO_RAD<float> << endl;
}