import scala.io.StdIn._
object Main extends App{
  val sc = new java.util.Scanner(System.in)
  var ka,s = sc.nextInt
  var ans=0
  for(i <- 0 to ka){
    if((i+2*ka)>=s){
      for(j <- 0 to ka){
        for(k <- 0 to ka){
          if((i+j+k)==s){
            ans+=1
          }
        }
      }
    }
  }
  print(ans)
}