import requests, json
method="wall.get"
domain="roctbb"
count = 100
offset= 0
token = '53e5487153e5487153e54871d8538926b7553e553e548710eb81191ec33873a1a5d7055'

url = "https://api.vk.com/method/wall.get?domain={}&offset={}&count={}&access_token={}&v=5.74".format(domain,offset, count, token)

response = requests.get(url)
data=response.json()
num=data['response']['count']
max_post=data['response']['items'][0]
for offset in range(0,num,100):
    url= "https://api.vk.com/method/wall.get?domain={}&offset={}&count={}&access_token={}&v=5.74".format(domain,offset, count, token)
    response = requests.get(url)
    data = response.json()
    for post in data['response']['items']:
        if post['likes']['count']>max_post['likes']['count']:
            max_post['likes']['count']=post['likes']['count']
print(max_post['likes']['count'])