uses crt;
var a: array[1..100] of integer;
i,n,s: integer;
begin
clrscr;
write('nhap n: '); readln(n);
for i:=1 to n do
begin
write('nhap PT thu ',i,': '); readln(a[i]);
if a[i]>0 then s:=s+a[i];
end;
write('tong cac so duong trong day la: ',s);
readln;
end.