Fun Count

Sleepy?? Hungry?? Better if we try to count just for fun.

Type your birthday date, then:
1. Multiply by 4
2. Add 13
3. Multiply by 25
4. Subtract by 200
5. Add your birthday month
6. Multiply by 2
7. Subtract by 40
8. Multiply by 50
9. Add 2 last digits of your birthday year
10. Subtract by 10500

Just try, in the end you must find an unique number..