#include<bits/stdc++.h>
using namespace std;
#define int long long
#define MOD 1000000007
int pw(int n,int m){
    if(m==0)return 1;
    if(m%2){
        return (n*pw(n,m-1))%MOD;
    }
    int t=pw(n,m/2);
    return (t*t)%MOD;
}
signed main(){
    int n;
    cin>>n;
    if(n==1){
        cout<<2<<endl;
    }else if(n%2==0){
        cout<<(4*pw(5,(n-2)/2))%MOD<<endl;
    }else{
        cout<<(3*4*pw(5,(n-2)/2))%MOD<<endl;
    }
    return 0;
}