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