https://www.luogu.com.cn/problem/P1424
"""
P1424 小鱼的航程(改进版)
https://www.luogu.com.cn/problem/P1424
"""
ans=0
x,n=map(int,input().split())
for i in range(n):
if x!=6 and x!=7:
ans+=250
if x==7:
x=1
else:
x+=1
print(ans)
