Untitled

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

int eulerTotient(int n) {
    int result = n;
    
    for (int i = 2; i <= sqrt(n); i++) {
        if (n % i == 0) {
            while (n % i == 0) {
                n /= i;
            }
            result -= result / i;
        }
    }
    
    if (n > 1) {
        result -= result / n;
    }

    return result;
}

int main() {
    int n;
    cout << "Enter a positive integer n: ";
    cin >> n;
    
    int result = eulerTotient(n);
    cout << "Euler's Totient Function f(" << n << ") = " << result << endl;

    return 0;
}