#include <fstream>
using namespace std;
ifstream fin("sume1.in");
ofstream fout("sume1.out");
#define MOD 1000000007
long long N;
long long rise(long long base, long long power) {
if(power == 0) {
return 1;
}
long long x = rise(base, power / 2);
if(power % 2 == 0) {
return (x * x) % MOD;
}
return (((x * x) % MOD) * base) % MOD;
}
int main() {
fin >> N;
fout << (rise(2, N + 1) + MOD - 1) % MOD << '\n';
fin.close();
fout.close();
return 0;
}
