Three:
"Yeeeees! Yes! YEEESSSS! Woohoooooooo!" Yang watched with amusement as her sister wasted scythe ammo in controlled bursts at the ground to bounce around.
"Ugh, really? Will she ever grow up?" Weiss scoffed, poorly hiding a smile at Ruby's antics. "Of course we graduated... it isn't like she expected to fail, so why is she so... so... happy?" She finished lamely, tossing long white hair over her shoulder.
"Aw, come on Weiss! She's been really stressed with finals, just let her get it out of her system. 'Kay?" Yang pretended to be straightening her gloves, attention absorbed into the act to give Weiss a moment to hide her grin. The girl never did get over her prickliness at being caught in a moment of 'plebeian' emotion showing.