#include<iostream>
using namespace std;

int main(){
    int limit;
    cin>>limit;
    
    if(limit<0){
        cout<<"invalid input";
        return 0;
    }
    int a=0,b=1;
    while(a<=limit){
        cout<<a;
        a=a+b;
        b=a-b;
        if(a<=limmit)cout<<""
        
        
    }
    return 0;
}