#include <iostream>

using namespace std;

int Fibonacci(int x) {
   if(x==1 || x==2) {
      return 1;
   } else {
      return Fibonacci(x-1) + Fibonacci(x-2);
   }
}

int main (int argc, char** argv) {

   if(argc!=2) {
      cerr << "Usage: " << argv[0] << " n" << endl;
      exit(EXIT_FAILURE);
   }

   int x = atoi(argv[1]);
   cout << "Result: Fibonacci(" << x << "): " << Fibonacci(x) << endl;

   return EXIT_FAILURE;
   
}