P1421 小玉买文具 2022.01.30

https://www.luogu.com.cn/problem/P1421

"""

P1421 小玉买文具 2022.01.30
https://www.luogu.com.cn/problem/P1421

"""

a,b=map(int,input().split())

c=a*10+b

ans=c//19

print(ans)