program project1;

Var

a1,b1,x,y,n,m,l,e,d,b,a,x1,y1:Int64;

Function extend_gcd(a,b:Int64;Var x,y:Int64):Int64;

Var

t:Int64;

Begin

IF b=0 then

Begin

extend_gcd:=a;

x:=1;y:=0;

End

Else

Begin

extend_gcd:=extend_gcd(b,a mod b,x,y);

t:=x; x:=y; y:=t-(a div b)*y;

End;

End;

begin

Readln(x,y,n,m,l);

IF n=m then Begin Writeln('Impossible'); Exit; End;

IF n>m then

Begin

b1:=((y-x)mod l+l)mod l;

a1:=(n-m)mod l;

End

Else Begin

a1:=(m-n)mod l;

b1:=((x-y)mod l+l)mod l;

End;

d:=extend_gcd(a1,l,x1,y1);

IF b1 mod d 0 then

Begin

Writeln('Impossible');

Exit;

End;

e:=x1*(b1 div d);

e:=e mod l;// -(e div l)*l;

While e0 do e:=e-l;

Writeln(e);

Readln(a1);

end.

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