x,c = input().split()
int(x)
y = True
n = False
overfee = 4
ans = 8
if c == n:
    if x <= 1000:
        print(ans)
    elif x > 1000:
        over = x - 1000
        while over >= 0:
            ans = ans + 4
            over = over - 500
        print(ans)
elif c == y:
    ans = ans + 5
    if x <= 1000:
        print(ans)
    elif x > 1000:
        over = x - 1000
        while over >= 0:
            ans = ans + 4
            over = over - 500
        print(ans)