program natjecanje;
var a,b,c,d,f,g,h:integer;
arr:array[1..20] of integer;
begin h:=0;
for a:=1 to 20 do arr[a]:=0;
readln(a,b,c);
for d:=1 to b do begin
read(f); arr[f]:=arr[f]+1;
end;
for d:=1 to c do begin
read(f); arr[f]:=arr[f]+2;
end;


for d:=1 to a do begin
if arr[d]=1 then begin
if (arr[d-1]=2) or (arr[d-1]=2) then begin
if arr[d-1]=2 then arr[d-1]:=0 else arr[d+1]:=0;
arr[d]:=0;
end else h:=h+1;
end;end;
writeln(h);
end.