#include <type_traits>
#include <cmath>
#include <iostream>

template <class Integer>
constexpr Integer bitwise_sqrt(const Integer& x)
{
   // TODO put real code here, doesn't need it for the bug case though
   return 0;
}
template <class Integer>
constexpr Integer fast_sqrt(const Integer& x)
{
   return static_cast<Integer>(std::sqrt(static_cast<double>(x)));
}
template <class Integer>
constexpr Integer get_sqrt(const Integer& x)
{
  if(std::is_constant_evaluated())
    return bitwise_sqrt(x);
   return fast_sqrt(x);
}


int main()
{
  unsigned i;
  std::cin >> i;
  i = get_sqrt(i);
  std::cout << i << std::endl;
}