Viet chuong trinh nhap vao day so nguyen theo thu tu tang hoac bang. In tong cac so vua nhap.
Yeu cau: Neu nhap sai (so sau nho hon so truoc) thi yeu cau nhap lai.
Chuong trinh dung khi so nhap vao la -1
VD: nhap so thu 1: 6
nhap so thu 2: 2
So khong hop le. Nhap lai
nhap so thu 2: 7
nhap so thu 3: 8
nhap so thu 4:-1
Tong 3 so la:21
Nho cac ban giup do. thanks all
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