Fibonacci Freeze

The Fibonacci numbers (0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...) are defined by the recurrence:

Write a program to calculate the Fibonacci Numbers.

Input and Output

The input to your program would be a sequence of numbers smaller or equal than 5000, each on a separate line, specifying which Fibonacci number to calculate.

Your program should output the Fibonacci number for each input value, one per line.

Sample Input

5
7
11

Sample Output

The Fibonacci number for 5 is 5
The Fibonacci number for 7 is 13
The Fibonacci number for 11 is 89

import java.util.Scanner;
import java.math.BigInteger;

public class Main {
	public static void main(String[] args) {
		Scanner keyboard = new Scanner(System.in);
		BigInteger[] F = new BigInteger[5001];
		F[0] = BigInteger.valueOf(0);
		F[1] = BigInteger.valueOf(1);
		for(int i = 2; i <= 5000; i++) {
			F[i] = F[i-1].add(F[i-2]);
		}
		int n;
		while(keyboard.hasNextInt()) {
			n = keyboard.nextInt();
			System.out.println("The Fibonacci number for " + n + " is " + F[n].toString());
		}
	}
}