include "std/io.zr"
include "std/containers.zr"

func main[] : i64
    n := [1]

    for j in 0..1000
        carry := 0
        for i in 0..n->size
            tmp : i64 = n->nth(i) * 2 + carry
            n->set(i, tmp % 10)
            carry = tmp / 10
        while carry > 0
            n->push(carry % 10)
            carry = carry / 10
    
    sum := 0
    for i in 0..n->size
        sum += n->nth(i)

    io.println_i64(sum)