#include <iostream>

int main() {
    int n, cyfra, suma = 0;
    std::cout << "n = ";
    std::cin >> n;
    do {
        cyfra = n%10;
        suma += cyfra;
        n /= 10;
    } while (n > 0);
    std::cout << "Suma cyfr: " << suma << "\n";
    system("pause");
    return 0;
}