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Cod sursa(job #277913)
const r=1000003;
var a:array[0..1000] of 0..1;
f,g:text;
i,n,m,x:longint;
ok:boolean;
begin
assign(f,'grigo.in');
reset(f);
assign(g,'grigo.out');
rewrite(g);
read(f,n,m);
for i:=1 to m do begin
read(f,x);
a[x-1]:=1;
end;
x:=1;
for i:=1 to n-1 do
if a[i]=0 then x:=(x*i) mod r;
writeln(g,x);
close(g);
end.