function Main(input) {
  var A = input.split(" ")[0];
  var B = input.split(" ")[1];
  
  A = parseInt(A,10);
  B = parseInt(B,10);
  
  var coin = 0;
  for(i=0; i<=1; i++){
    if(A>=B){
      coin += A;
      A -= 1;
    }else{
      coin += B;
      B -= 1;
    }
  }
    
  console.log(coin);
  
  
  


  
}

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