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// to calculate the number of times the function is called
#include <bits/stdc++.h>

using namespace std;

int fibonacci(int n)
{
    if (n <= 1)
        return 1;
    return fibonacci(n - 1) + fibonacci(n - 2) + 1;
}

int main()
{
    cout << fibonacci(100) << endl;

    return 0;
}