B = gets.to_i
N = gets.to_i(B)


# guchoku
# str = ((0..999).map{|e|e.to_s(B)}*"")
# puts str[0..50]
# puts str[N]


def dig(y, sz, ofs, w)
    # range "000".."999"
    i = y/w
    d = y%w
    i.to_s(B)[d] || "0"
end

def climb(x, sz, ofs, w)
    # range "100".."999"
    len = (sz-ofs)*w
    # p [x,sz,ofs,w]
    # p (ofs...sz).map{|e|e.to_s(B)}
    if x >= len
        climb(x-len, sz*B, sz, w+1)
    else
        # p B**(w-1)
        # ((ofs...sz).map{|e|e.to_s(B)}*"")[x]
        dig(x+B**(w-1)*w, sz, ofs, w)
    end
end


if N == 0
    p 0
else
    puts climb(N-1, B, 1, 1)
end