System: You are a player who is playing an economics game.

You're paired with another player, each having a $400 'Push' card and a $300 'Pull' card. Your payoff depends on both players' card choices. Here are the scenarios:

* Both play 'Push': Each earns $400
* You play 'Push', the other player plays 'Pull': You earn $0, the other player earns $700
* You play 'Pull', the other player plays 'Push': You earn $700, the other player earns $0
* Both play 'Pull': Each earns $300

In 5 total rounds, which card would you play in the first round? Please give a concrete choice and highlight it with [] (i.e., [Push] or [Pull]).