x,n = map(int,input().split()) a = n // 7 sum = 0 if x < 6:

for i in range(1, n-2*a+1):
    sum += 250
print(sum)

elif x == 6: for i in range(1,n-2-2a+1): sum += 250 print(sum) else: for i in range(1,n-2a): sum += 250 print(sum)