Mã nộp #13779 | Số nguyên không âm đẹp

Main.java:1: error: class, interface, or enum expected
int add = (r/4 - (l-1)/4) + (r/7 - (l-1)/7) + (r/11 - (l-1)/11);
^
Main.java:2: error: class, interface, or enum expected
			int plus = ((r/28 - (l-1)/28) + (r/44 - (l-1)/44) + (r/77 - (l-1)/77)) + (r/308 - (l-1)/308);
			^
Main.java:3: error: class, interface, or enum expected
			System.out.println(add - plus);
			^
3 errors