add bigger number

blah blah blah insert story here blah blah blah blah blah blah blah blah blah blah blah

for this problem, take the input and add up the bigger number (or any number if they're equal) on each line

example

2 5
-2 1
5 2
0 2
-4 -3

should give 5 + 1 + 5 + 2 + (-3) = 10