500
If I go to the football game tonight, then I will get to see Megan.
If I get to see Megan, then I can ask her out.
If I can ask Megan out, Megan will say yes.
If Megan says yes, then I can take Megan to dinner.
If I go to the football game tonight, then I can take Megan out to dinner.
First 'if', last 'then'