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#include <iostream>
#include <fstream>
#include <iomanip>
#include <cmath>
#include <vector>
int recurtion(int a) {
if (a > 0) return recurtion(a - 1) + recurtion(a - 2);
else return 1;
}
using namespace std;
int main(){
int a;
cin >> a;
std::cout << recurtion(a);
}