import java.util.*;
public class tatatz {

	public static void main(String[] args) {
		Scanner ler = new Scanner(System.in);
		System.out.print("Infomre o valor de N: ");
		int n = ler.nextInt();
		fibonacci(n);
		System.out.printf("O N'esimo numero é: %d", fibonacci(n));
	}
	public  static int fibonacci (int x){
		int a = 1,b = 0;
		for(int i = 1;i < x; i++){
			a = a + b;
			b = a - b;


		}
		return a;
	}
}