program p1121;

var n,m,bx,by,i,j:integer;

a:array[-2..17,-2..17]of integer;

b:array[1..2,1..8]of integer=((1,2,-1,-2,1,2,-1,-2),(2,1,-2,-1,-2,-1,2,1));

f:array[-2..17,-2..17]of integer;

begin

read(bx,by,n,m);

f[0,0]:=1;

fillchar(a,sizeof(a),0);

fillchar(f,sizeof(f),0);

a[n,m]:=1;

for i:=1 to 8 do

a[n+b[1,i],m+b[2,i]]:=1;

for i:=0 to bx do

for j:=0 to by do

if (a=0) then

begin

f:=f+f;

f[0,0]:=1;

end;

write(f[bx,by]);

end.