a = list(map(int, input().split()))
x = a[0]
n = a[1]

loog = 0
i = 0
while i < n:
    if x != 6 and x != 7:
        loog = loog + 250
    elif x == 7:
        x = 1
    else:
        x = x + 1
print(loog)