#include <iostream>
using namespace std;
int sumOfDigits = 0;
void SumOfDigits(int n){
if(n%10 == 0){
cout << sumOfDigits;
return;
}
sumOfDigits += n%10;
n /= 10;
SumOfDigits(n);
}
int main() {
int n;
cin >> n;
SumOfDigits(n);
return 0;
}
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