public class Fibonacci {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int fn = fib(n);
System.out.println("斐波那契数列的第n项为:" + fn);
}
public static int fib(int n) {
int fn = 0;
if (n == 1 || n == 2) {
fn = 1;
} else {
fn = fib(n - 1) + fib(n - 2);
}
return fn;
}
}