ARPZ_s1_pr4/alg_4_2.cpp

#include <iostream>
using namespace std;

int fib(int n)
{
	if (n == 0) { return 1; }
	if (n == 1) { return 1; }

	return fib(n - 1) + fib(n - 2);
}

int main()
{
	int n; cin >> n;

	cout << fib(n);
}