program invmod;
var a,b,x,y,d,z:longint;
    f1,f2:text;
function gcd(a,b:longint):longint;
begin
if b=0 then begin x:=1; y:=0; gcd:=a; end else begin
gcd:=gcd(b,a mod b);
z:=x; x:=y;
y:=z-(a div b)*y;
end;
end;
begin
assign (f1,'inversmodular.in');
assign (f2,'inversmodular.out');
reset (f1);
rewrite (f2);
readln (f1,a,b);
d:=gcd(a,b);
while x<0 do x:=x+b;
writeln (f2,x);
close (f1);
close (f2);
end.