var
b,a:array[1..50000]of int64;
n,m,i,j:longint;
begin

readln(n);
for i:=1 to n do
readln(a[i]);

readln(m);
for j:=1 to m do
readln(b[j]);

for i:=1 to n do
for j:=1 to m do
if a[i]+b[j]=10000 then begin writeln('YES'); halt(0);end;
writeln('NO');
end.

n<=50000? m<=50000, 50000*50000=2 500 000 000, so in simple computer it is 2500 seconds, it is too long, isn't it?))