#include <iostream>

using namespace std;

int GCD(size_t a, size_t b);

int main() {
     
     size_t a = 2*2*2*3*3*5*5*7*7*11;
     size_t b = 2*2  *3  *5         *13*17;

     cout << "The GCD of " << a << " and " << b << " is " << GCD(a,b) << endl;

     return 0;
}

int GCD(size_t a, size_t b) {
   if (b == 0) {
       return a;
   } else {
       return GCD(b,a%b);
   }
}