** What will this program output? **

“`c++
#include

unsigned long long factorial(int n) {
if (n == 0 || n == 1) {
return 1;
}
return n * factorial(n – 1);
}

int sumOfDigits(unsigned long long n) {
int sum = 0;
while (n != 0) {
sum += n % 10;
n /= 10;
}
return sum;
}

int main() {
unsigned long long fact = factorial(10);
std::cout << sumOfDigits(fact) << std::endl; return 0; } ```