import Foundation

if  let input = readLine(),
    let nums:[Int] = {
        let temp = input.split(separator: " ").compactMap({Int($0)})
        return temp.count == 3 ? temp : nil
    }(){
    var (N, r, c) = (nums[0],nums[1],nums[2])

    var n = N
    var result = 0

    while n > 0 {
        let half = Int(pow(2.0, Double(n-1)))
        let quatorArea = half * half

        switch (r,c)
        {
            case (0..<half, 0..<half) :
                break
            case (0..<half, half..<2*half) :
                result += quatorArea
                c -= half
            case (half..<2*half, 0..<half) :
                result += quatorArea*2
                r -= half
            case (half..<2*half, half..<2*half) :
                result += quatorArea*3
                c -= half
                r -= half
            default :
                break
        }

        n -= 1
    }

    print(result)

}
else{
    print("error")
}