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#include <bits/stdc++.h>
using namespace std;

#define endl '\n'

typedef long long int llint;
typedef unsigned long long int ullint;

llint Fibo(int N)
{
    if (N == 0 || N == 1)
    {
        return N;
    }
    return Fibo(N - 1) + Fibo(N - 2);
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    // cin >> t;
    while (t--)
    {
        int N;
        cin >> N;
        cout << Fibo(N) << endl;
    }
    return 0;
}
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