def jj(step):
    if __________:
        t = 0
    else:
        t = 0.3 + (step - 1000) // 2000 * 0.1
        t = min(3,t)
    return(t)

x=list(map(int,input().split(",")))
f=list(map(int,input().split(",")))
n=len(f)
total, c = 0, 0
for i in range(n):
    if f[i]==1:
        __________
        if c >= 4:
            total =total+ 2*jj(x[i])
        else:
            total += jj(x[i])
    else:
        __________
print(round(total,1))