with open(r'day12/input.txt', 'r') as input:
    lines = input.read().split('\n')[:-1]
areas = []

i = -1
for line in lines:
    if 'x' in line:
        dim,reqs = line.split(':')
        dim = list(map(int,dim.split('x')))
        reqs = list(map(int,reqs.strip().split(' ')))
        areas.append((dim,reqs))

count = 0
for dim,reqs in areas:
    count += 1 if dim[0]*dim[1] >= sum(reqs)*9 else 0
print(count)