Kilogram

Og`irlik M kilogramda berilgan. Undagi to`liq tonnalar sonini aniqlovchi dastur tuzing.(1 t = 1000 kg)

Input Format

bir qatorda M < 10^7 bo'lgan sonlar orasidan kiritiladi.

Output Format

M ichida nacha kg borligini yagona qatorda int typeda chiqaring.

Sample Input

1560

Sample Output

1

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