| Program Tinhoc | Program Tinhoc; |
| Var i,n,S:real | Var i,n,S:real |
| Begin | Begin |
| Write(nhap so); | Write("nhap so"); |
| readln(n); | readln(n); |
| i=1; | i:=1; |
| while i<n | while i<n do |
| begin | begin |
| s:=s+i | s:=s+i; |
| i:=i+1 | i:=i+1; |
| end; | end; |
| write('Ket qua la: ' S); | write('Ket qua la: ' ,S); |
| readln; | readln; |
| end | end. |
