Missing Mango

Time Limit	Memory Limit	Input File	Output File
1 second	256 MiB	`manin.txt`	`manout.txt`

- Subtask 1 (30 points) has 20 cases.
- Subtask 2 (15 points) has 13 cases.
- Subtask 3 (15 points) has 17 cases.
- Subtask 4 (40 points) has 41 cases.