function Main(input){
  input = input.split("\n");
  inputStr = input[0].split(" ");
  var L = Number.parseInt(inputStr[0]);
  var R = Number.parseInt(inputStr[1]);
  var arr = [];
  
  if ( L * R > 2019){
    for(var i1 = L; i1 < R; i1++){
      for(var i2 = L+1 ; i2 < R+1; i2++){
        arr.push(i1*i2%2019);
        //console.log(i1);
        //console.log(i2);
        //console.log(i1*i2);
      }
    }
    console.log(Math.min.apply(null,arr));
  } else {
    //LとRの積が2019を超えないなら計算する必要がない
    console.log(L * (L+1));
  }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));