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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