var add = (function() {
    var consoleLog = console.log,
        result = 0;

    function addition( n ) {
        result += n;
        return addition;
    }

    console.log = function( obj ) {
        if (obj == addition) {
            consoleLog( result );
        } else {
            consoleLog( obj );
        }
    };

    return addition;
}());

console.log( add( 1 )( 2 )( 3 ) );