4 write "Fib";

     1 write "Fib";

     5 read n;  

     2 read n;  

     6 minus1 := 0;

     3 minus1 := 0;

     7 minus2 := 1;

     4 minus2 := 1;

     8 while n > 0 do {

     5 while n > 0 do {