import java.util.*;

class Fib {

  static public int fibnm1, fibnm2, curr;
  static public int fibarr[];
  
  static public int Fib1 (int n) {
	  if ((n==1) || (n==2)) 
		  return 1;
	  else 
		  return (Fib1(n-1) + Fib1(n-2));
  }
  
  static public int Fib2 (int n) {
	  fibnm2 = 1; 
	  fibnm1 = 1;
	  curr = 1;
	  for (int i = 3; i<=n; i++) {
		  curr = fibnm2 + fibnm1;
		  fibnm2 = fibnm1;
		  fibnm1 = curr;	  
	  }
	  return(curr);  
  }  

  static public int Fib3 (int n) {
	  fibarr[1] = 1;
	  fibarr[2] = 1;
	  for (int i = 2; i<=n; i++) {
		  fibarr[i] = fibarr[i-1] + fibarr[i-2];
	  }
	  return(fibarr[n]);  
  }  
  
  static public int Fib4 (int n) {
	  if (fibarr[n] != 0)
		  return fibarr[n];
	  
	  int result;
	  if ((n==1) || (n==2))
		  result = 1;
	  else 
		  result = Fib4(n-1) + Fib4(n-2);
	  fibarr[n] = result;
	  return result;
  }
  
  public static void main (String args[]) {
	fibarr = new int[100];
	long startTime, finishTime;
	startTime = System.currentTimeMillis();
	System.err.println(Fib1(43));
 	finishTime = System.currentTimeMillis();
	System.err.println(
			"Elapsed time (milliseconds): " +
			(finishTime - startTime));
  }
}