program taverna;
const MAX=1000;
var A,B,conta:integer;
    uscita:boolean;
begin
	readln(A,B);
	conta:=0; uscita:=false;
	while ((A<>1) or (B<>1)) and (uscita=false) do
	              begin
	                 if (A mod 2=0) and (B mod 2=0) then begin  A:=A div 2;  B:=B div 2; end
	                                                else
	                                                    if(A mod 2<>0) and (B mod 2<>0) then begin A:= 3*A+1; B:= 3*B+1; end 
	                                                                                    else
	                                                                                        begin
	                                                                                          if (A mod 2<>0) then A:=A+3;
	                                                                                          if (B mod 2<>0)  then B:=B+3;
	                                                                                        end;  
	                conta:=conta+1;
	                if ((A=1) and (B=2)) or ((A=2) and (B=1)) then uscita:=true;
	              end;
  if uscita=true then writeln(-1)
                 else writeln(conta)	              
end.

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