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- #include <stdio.h>
- #include <stdlib.h>
- int func (long long n)
- {
- if (n == 0) return 0;
- return (n%10) + func(n/10)-1;
- }
- int main()
- {
- long long n;
- scanf("%lld", &n);
- printf("%d", func(n));
- return 0;
- }
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