#include <iostream>
#include <sstream>
#include <iomanip>
using namespace std;

int main () {

  float val =31511.4424;
  stringstream ss (stringstream::in | stringstream::out);

  ss << fixed << setprecision(2) << val;
  
  string test = ss.str();

  cout << test <<endl;

  return 0;
}