Python: When will the following loop terminate?

while keep$\_$going $!=999$:

student $=1$

while student $<=3$:

total $=0$

for score in range$(1,4)$:

score $=$ int$($input$("$Enter test score: $"))$

total $+=$ score

average $=$ total$/3$

print$("$Student $",$ student, "average: $",$ average$)$

student $+=1$