How to resolve Index Error in my code?

[codify110]

This is the code

MAX, MIN = 1000, -1000


# Returns optimal value for current player
# (Initially called for root and maximizer)
def minimax(depth, nodeIndex, maximizingPlayer,
            values, alpha, beta):
    # Terminating condition. i.e
    # leaf node is reached
    if depth == 3:
        return values[nodeIndex]

    if maximizingPlayer:

        best = MIN

        # Recur for left and right children
        for i in range(0, 2):

            val = minimax(depth + 1, nodeIndex * 2 + i,
                          False, values, alpha, beta)
            best = max(best, val)
            alpha = max(alpha, best)

            # Alpha Beta Pruning
            if beta <= alpha:
                break

        return best

    else:
        best = MAX

        # Recur for left and
        # right children
        for i in range(0, 2):

            val = minimax(depth + 1, nodeIndex * 2 + i,True, values, alpha, beta)
            best = min(best, val)
            beta = min(beta, best)

            # Alpha Beta Pruning
            if beta <= alpha:
                break

        return best

    # Driver Code


if __name__ == "__main__":
    scr = []  # List for Leaf Nodes
    x = int(input("Enter total number of leaf nodes="))
    for i in range(0,x):
        y = int(input("Enter Leaf Value: "))
    scr.append(y)



    print("The optimal value is :", minimax(0, 0, True, scr, MIN, MAX))

I am just trying to modify this code :
https://www.geeksforgeeks.org/minimax-al...a-pruning/
by allowing user to enter the leaf nodes itself.
But I am getting this error : File "C:\Users\Hp\PycharmProjects\lab4\Hilclimbing.py", line 15, in minimax return values[nodeIndex]
IndexError: list index out of range