백준 2747 java

import java.util.Scanner;

public class bj2747
{
    public static void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);
        int n;
        int i;
        int a = 0, b = 1, temp;

        n = scanner.nextInt();
        for(i = 0; i < n - 1; i++)
        {
            temp = a + b;
            a = b;
            b = temp;
        }
        System.out.println(b);

        scanner.close();
    }
}