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

int fib(int n) {
    if(n == 1 or n == 2) {
        return 1;
    }
    return fib(n - 1) + fib(n - 2);
}
int main() {

    cout << fib(4) << endl;

    return 0;
}
// fib(4) = fib(3) + fib(2) = 2 + 1 = 3
// fib(3) = fib(2) + fib(1) = 1 + 1 = 2
// fib(2) = 1
// fib(1) = 1
// fib(2) = 1