#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define X first
#define Y second
#define mp make_pair
#define MOD 1000000007

ll a[111111] = {0};
ll b[111111] = {0};

int main() {
    int n;
    cin >> n;
    ll ans = 20;
    a[0] = b[0] = 1;
    for (int i = 1; i < n; i++) {
        a[i] = (a[i-1]*27) % MOD;
        b[i] = (b[i-1]*7) % MOD;
    }
    ll sum = 0;
    for (int i = 0; i < n; i++) {
        sum = (sum + a[i]*b[n-1-i]) % MOD;
    }
    cout << ans  * sum % MOD;
}