#!/usr/bin/env ruby

require "matrix"


def solve(b1, b2, b3)
    co_mat = Matrix[[b2, 1], [b1, 1]]
    v = Vector[b3, b2]
    rd = co_mat.inv * v
    b4 = Matrix[[b3, 1]] * rd
    return b4[0].to_i
end


def main()
    b1, b2, b3 = gets.split.map(&:to_i)
    b4 = solve(b1, b2, b3)
    puts b4.to_s
end


main