That depends on how many more times you are going to 
roll the dice and what you mean by "that number".  Are 
you only going to roll it one more time? Or more than 
one more time?  And does "that number" mean "3 on the 
first and 4 on the second" or does it mean "any sum of 
7 on the two dice"?

We have to know these things before we can answer your question.

Edwin