ans [1] = 1, ans [2] = 2
ans [ i ] = ans [ i-1 ] + ans [ i-2 ] ( i >=3 )
//#include<bits/stdc++.h>
using namespace std;
int main(){
vector<long long> ans(10001);
ans[1]=1;
ans[2]=2;
for(int i=3; i<=10000; i++){
ans[i]=(ans[i-1]+ans[i-2])%1000000007;
}
int n;
while(cin>>n) cout<<ans[n]<<endl;
return 0;
}