#include <iostream>

int gcd(int a, int b) {
    int result = 1;
    
    for (int i = 2; i <= std::min(a, b); ++i) {
        while (a % i == 0 && b % i == 0) {
            result *= i;
            a /= i;
            b /= i;
        }
    }

    return result;
}

int main() {
    int num1, num2;
    std::cout << "Enter two numbers: ";
    std::cin >> num1 >> num2;

    std::cout << "GCD: " << gcd(num1, num2) << std::endl;

    return 0;
}

#include <iostream>

int gcd(int a, int b) {
    while (b != 0) {
        int temp = b;
        b = a % b;
        a = temp;
    }
    return a;
}

int main() {
    int num1, num2;
    
    std::cout << "Enter two numbers: ";
    std::cin >> num1 >> num2;

    int result = gcd(num1, num2);

    std::cout << "GCD of " << num1 << " and " << num2 << " is: " << result << std::endl;

    return 0;
}