program ct;
uses crt;
var A:array[1..1000] of integer;
i,n,k:integer;
begin clrscr;
write('Nhap so phan tu: '); readln(n);
for i:=1 to n-1 do
begin
write('Nhap A[',i,']: '); readln(A[i]);
end;
for i:=1 to n-1 do
if A[i]<0 then k:=i;
write('Chi so cua so hang am dau tien cua day la: ',k);
readln;
end.