# f1 = input('enter fruit no 1') #press alt and click to generate 2 cursors
# f2 = input('enter fruit no 2')
# f3 = input('enter fruit no 3')
# f4 = input('enter fruit no 4')
# f5 = input('enter fruit no 5')
# f6 = input('enter fruit no 6')
# f7 = input('enter fruit no 7')
#
# fl = [f1, f2, f3, f4, f5, f6, f7]
# print(fl)
#

# mk1 = int(input('enter marks of student 1 : '))
# mk2 = int(input('enter marks of student 2 : '))
# mk3 = int(input('enter marks of student 3 : '))
# mk4 = int(input('enter marks of student 4 : '))
# mk5 = int(input('enter marks of student 5 : '))
# mk6 = int(input('enter marks of student 6 : '))
#
# mkl = [mk1, mk2, mk3, mk4, mk5, mk6]
# mkl.sort()
# print(mkl)

# a = [2, 7, 9, 16]
# print(sum(a))

a = (4, 0, 5, 2, 0, 9, 0, 3, 0)
print(a.count(0))
