function myout(text){console.log(text);}//standard output
function Main(input) {
	//input = parseInt(input);
	//input = input.split(" ");
	//input = input.split("\n");
	input = input.split(" ").map((a)=>Number(a));
	//input = input.split("\n").map((a)=>Number(a));
  var K = input[0];
  var S = input[1];
  var output = 0;
  for(var i = 0; i <= K; i++){
    for(var j = 0; j <= K; j++){
      for(var l = 0; l <= K; l++){
        if(i + j + l == S){
           output++;
           }
      }
    }
  }
  myout(output);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim());