Little Jack Horner's pie contains 17 raspberries, 3 peach slices, 28 apple slices, 4 pear slices, 89 raisins, 67 cherries, 2 plums. How many times will he have to stick his thumb into the pie before he is sure to pull out two pieces of the same fruit?

I don't know where to begin to solve this. Please explain...how do you simplify it?

I don't just need the answer...I need the explanation of how you get to it. They gave this problem to my 5th grader.