{% url 'users:profile' as profile_page_url %} {% url 'users:profile_edit' as profile_edit_page_url %} Musbat sonlar

Musbat sonlar

Uchta butun son berilgan. Shu sonlar orasidan nechta musbat son borligi aniqlovchi dastur tuzing.

Input Format

bir qatorda uchta son < 10^6 kiritiladi

Output Format

bitta butun son, javobini chiqaring

Sample Input

0 -13 2

Sample Output

1
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