#include<bits/stdc++.h>
using lint=long long;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n;std::cin>>n;
    std::vector<lint>a(n+1);
    a.at(1)=1;
    lint mod=1'000'000'007;
    for(lint i=2;i<=n;i++){
        a.at(i)=(a.at(i-2)+i*a.at(i-1))%mod;
    }
    std::cout<<(a.at(n)-(2<=n?a.at(n-2):0ll)+mod)%mod<<'\n';
}