#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
#include <set>
using namespace std;

/*
 da se napise programa koja ke gi sobere cifrite na eden broj
 rekurzivno
 **/
int dp[1005];
int fib(int n) {
    if(n <= 2) {
        return 1;
    }
    if(dp[n] != -1) {
        return dp[n];
    }
    return dp[n] = fib(n - 1) + fib(n - 2);
}
int main() {
    ios::sync_with_stdio(false);
    memset(dp, -1, sizeof dp);
    cout << fib(5) << endl;
    return 0;
}
// fib(5) = fib(4) + [fib(3)] = 3 + 2 = 5
// fib(4) = fib(3) + fib(2) = 2 + 1 = 3
// fib(3) = fib(2) + fib(1) = 2
// fib(2) = 1
// fib(1) = 1
// fib(2) = 1
// fib(3) = 2