10 friends meet for movie 20 for picnic and 5 for games 4 for movie & picnic 2 for movie & games , 0 for picnic & games , 2 for all , how many are students are there in all ?
n0 = 10.0
n1 = 20.0
n2 = 5.0
n3 = 4.0
n4 = 2.0
n5 = 0.0
n6 = 2.0
t0 = n0 + n1
t1 = t0 - n3
t2 = n2 + t1
t3 = t2 - n4
answer = n4 + t3
print(answer)