/*
VIM: let b:lcppflags="-std=c++14 -O2 -pthread -I."
VIM: let b:wcppflags="/O2 /EHsc /DWIN32"
VIM-: let b:cppflags=g:Iboost.g:Itbb
VIM-: let b:ldflags=g:Lboost.g:Ltbb
VIM-: let b:ldlibpath=g:Bboost.g:Btbb
VIM-: let b:argv=""
*/
#include <iostream>
#include <exception>
#include <chrono>
#include <algorithm>

struct node
{
    node * left;
    node * right;
    int value;
};

long long max_value_of_path_sum( node * root )
{
    if ( !root ) {
        return 0;
    }

    auto lm = max_value_of_path_sum( root->left );
    auto rm = max_value_of_path_sum( root->right );

    return root->value + std::max(lm, rm);
}

int main ( void )
{try{
    auto begin = std::chrono::high_resolution_clock::now();


    //......

    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> seconds = end - begin;
    std::cout << "Time: " << seconds.count() << std::endl;
    return 0;
}
catch ( const std::exception& e )
{
    std::cerr << std::endl
            << "std::exception(\"" << e.what() << "\")." << std::endl;
    return 2;
}
catch ( ... )
{
    std::cerr  << std::endl
            << "unknown exception." << std::endl;
    return 1;
}}