#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;

string sum(string s1,string s2)
{
    if(s1.length()<s2.length())
    {
        string temp=s1;
        s1=s2;
        s2=temp;
    }
    int i,j;
    for(i=s1.length()-1,j=s2.length()-1;i>=0;i--,j--)
    {
        s1[i]=char(s1[i]+(j>=0?s2[j]-'0':0));   //注意细节
        if(s1[i]-'0'>=10)
        {
            s1[i]=char((s1[i]-'0')%10+'0');
            if(i) s1[i-1]++;
            else s1='1'+s1;
        }
    }
    return s1;
}
int main(){
    string s1[210];
    int n; 
    s1[0]="0";s1[1]="1";
    for(int i=2; i<201; ++i){
        s1[i]=sum(s1[i-1],s1[i-2]);
    }
    while(scanf("%d",&n)!=EOF){
        cout<<s1[n+1]<<endl;
    }
    
    return 0; 
}