#include <iostream>
#include <cmath>
using namespace std;

void a(int x) {
    int result = x + x*x + x*x*x;
    cout << "a fonksiyonu sonucu: " << result << endl;
}

void b(int x) {
    double result = sqrt(x) / pow(x, 3);
    cout << "b fonksiyonu sonucu: " << result << endl;
}

void c(int x) {
    double result = abs(x) / exp(x);
    cout << "c fonksiyonu sonucu: " << result << endl;
}

int main() {
    int x;
    cout << "x degerini giriniz: ";
    cin >> x;

    if (x < 10) {
        a(x);
    }
    else if (x >= 10 && x <= 20) {
        b(x);
    }
    else {
        c(x);
    }

    return 0;
}