#include <iostream>
#include <boost/multiprecision/cpp_bin_float.hpp>


typedef boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<128, boost::multiprecision::backends::digit_base_2> > ext_float_t;

int main(int, char**) {
  ext_float_t a("7.7e+646456915");
  ext_float_t b("2.2e-78");
  std::cout
    << a << " + " << b << " = " << a + b << "\n"
    ;

  return 0;
}