#include<bits/stdc++.h>
using namespace std;
int main (){
	int a=1,b=1,c=0,n,i;
	cin>>n;
	if(n==1){
		cout<<"1.00" ;
	}
	else if(n==2){
		cout<<"1.00";
	}
	for(i=3;i<=n;i++){
		c=a+b;
		a=b;
		b=c;
	}
	cout<<c<<".00";
}

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