I'm trying make Flowchart for function calculate a number in the Fibonacci Series. But It looks like not right. I don't how draw the recursive function. Please help me how to fix it.

My flowchart: DIA

This is my code:

#include <iostream>
using namespace std;

long long Fibonacci(int input);

int main()
{
    cout << "Input Fibonacci Index number: ";
    int Index = 0;
    cin >> Index;
    cout << Fibonacci(i) << endl;
    return 0;

}
long long Fibonacci(int input)
{
    if (input < 2)
        return input;
    else
    {
        return Fibonacci(input - 1) + Fibonacci(input - 2);
    }
}