program natjecanje;
var n,s,r,i,j,br: integer;
    e,u,b: array [1..10] of integer;
begin
        readln (n, s, r);
        for i:=1 to s do begin
                read(u[i]);
        end;
        readln;
        for i:=1 to r do begin
                read(b[i]);
        end;
        readln;

        for i:=1 to n do begin
                e[i]:=1;
        end;

        for j:=1 to n do begin
                for i:=1 to s do begin
                        if u[i]=j then e[j]:=0;
                end;
        end;
        for j:=1 to n do begin
                for i:=1 to r do begin
                        if b[i]=j then e[j]:=e[j]+1;
                end;
        end;

        for i:=1 to n do begin
                if e[i]=2 then begin
                        if i=1 then begin
                                if e[2]=0 then begin
                                        e[1]:=1;
                                        e[2]:=1;
                                end;
                        end
                        else begin
                                if e[i-1]=0 then begin
                                        e[i]:=1;
                                        e[i-1]:=1;
                                end
                                else if e[i+1]=0 then begin
                                        e[i]:=1;
                                        e[i+1]:=1;
                                end;
                        end;
                end;
        end;
        br:=0;
        for i:=1 to n do begin
                if e[i]=0 then br:=br+1;
        end;
        writeln(br);
end.