How to understand SAM flag

#	Binary	Decimal	Hexadecimal	Description
1	1	1	0x1	Read paired
2	10	2	0x2	Read mapped in proper pair
3	100	4	0x4	Read unmapped
4	1000	8	0x8	Mate unmapped
5	10000	16	0x10	Read reverse strand
6	100000	32	0x20	Mate reverse strand
7	1000000	64	0x40	First in pair
8	10000000	128	0x80	Second in pair
9	100000000	256	0x100	Not primary alignment
10	1000000000	512	0x200	Read fails platform/vendor quality checks
11	10000000000	1024	0x400	Read is PCR or optical duplicate
12	100000000000	2048	0x800	Supplementary alignment

Instruction: enter whatever SAM flag (e.g. 99) to get a quick interpretation of its meaning, or click on arbitrary rows to select/deselect them to calculate the corresponding flag value. As you can see, your typed flag is a just sum of the matched bits in green.

http://www.samformat.info/sam-format-flag