#include <iostream>
using namespace std;
int smallestDigit(int x) {
    if (x < 10) return x;
    int ans = smallestDigit(x / 10);
    if (ans < x % 10) return ans;
    return x % 10;
}
int main() {
    cout << smallestDigit(29) << endl;
    cout << smallestDigit(31415) << endl;
    cout << smallestDigit(7) << endl;


    system("pause");
    return 0;
}

#include <iostream>
using namespace std;
int mystery(int n) {
    if (n == 0)
        return 1;
    else
        return enigma(2, mystery(n - 1));
}

int enigma(int n1, int n2) {
    if (n1 == 0)
        return 0;
    else
        return n2 + enigma(n1 - 1, n2);
}

int main(){
    cout << mystery(3);
    system("pause");
    return 0;
}