Find Nth fibonacci number

            public int FindNthFibonacciNumber(int n)
{
    if (n == 1 || n == 2) return 1;

    int nthfibonacciNumber = FindNthFibonacciNumber(n - 1) + FindNthFibonacciNumber(n - 2);
    return nthfibonacciNumber;
}