Maybe some day the six-year, $40 million contract will change David Pastrnak a little bit. But for now, the Bruins winger remains the same goofy kid with a deadpan sense of humor. Asked yesterday what his first big purchase would be now that he’s struck it rich, the 21-year-old Czech Republic product said he’d already made it. “I got dinner yesterday. Rice and chicken. Teriyaki. That’s the first thing I did,” said Pastrnak before flashing his chipped-tooth grin. The Bruins were made whole with the arrival of Pastrnak, whose “holdout” lasted all of about eight minutes Thursday before he signed the deal that will cost the team $6.667 million against the salary cap. While Pastrnak’s contract situation served as speculation fodder throughout the summer, it never seemed like this could spiral out of control. Things tend to get done when both parties are in agreement on what the end result should be. Pastrnak likes Boston and the Bruins. The Bruins like Pastrnak. It was going to get done. All it needed was a little pressure of lost training camp time for both sides to come together. “Obviously it was a new experience. I can’t say I was nervous. I’m the kind of guy who was focusing on the season,” said Pastrnak, who flew in from home Friday. “Obviously it was a little bit harder when it turns to September and all the guys from Czech return to their towns and are getting ready for the seasons. I kind of stayed there by myself. It was a little bit tougher, but I can’t say I really got nervous. Obviously, I wanted to get it done and get here with the guys. But that’s how it works and sometimes you need to be patient.” Pastrnak left it up to the professionals. “Both sides wanted to get it done as soon as it could get done,” he said. “But sometimes you can’t find an agreement until we did. I want to thank (agent) J.P. (Barry) for a great job. I trust him and I let him do his job. Obviously, it was my first time so I didn’t really know how it works. I didn’t really go much into it. And (general manager) Don Sweeney has done many contracts, so I left it for more experienced guys.” The only time Pastrnak thought negotiations might last longer than expected was when he put his head on the pillow on the eve of training camp.