C语言的递归问题，我运行不出来

Question

//define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int Fib(int n)
{
    if (n <= 2) 
        return 1;
    else
        return Fib(n - 1) + Fib(n - 2);
}
int main()
{
    int n = 0;
    int ret = 0;
    scanf_s("%d", &n);
    ret = Fib(n);
    printf("ret=%d\n", ret);
    return 0;
}

Answer 1

输入的n是多少