#include <iostream>

int sumtorial( int value )
{
    if ( value )
    {
    	std::cout << value ;
    	
    	if (value - 1)
    		std::cout << " + " ;
    		
        value += sumtorial(value-1) ;
    }
    
    return value ;
}

int main()
{
	int result = sumtorial(6) ;
    std::cout << " = " << result << '\n' ;
}