text: //*************************************************************************
  //* File Name: fibo.cpp
  //* Author:GeekBear
  //* Mail:zeerre98988@gmail.com 
  //* Created And Modified Time: ====2022-03-07  16-14-15====
  //*************************************************************************
  
  #include <iostream>
  using namespace std;
  int fibo(int n);
  int main() {
      int a;
      cin>>a;
      cout<<fibo(a);
      return 0;
  }
  
  int fibo(int n){
      int s;
      if(n<=0) s=0;
      if(n==1) s=1;
      if(n>1)  s=fibo(n-1)+fibo(n-2);
      return s;
  }
  