Function main

CSES_Problems/Bit Strings/solution.cpp:10–21

*/

signed main() {
        int n;
        cin >> n;
        const int mod = 1e9 + 7;
        int ans = 1;
        for(int i = 0; i < n; i++) {
                ans *= 2;
                ans %= mod;
        }
        cout << ans <<"\n";
        return 0;
}