n = int(input())
print((pow(3, n * 3) - pow(7, n)) % (pow(10, 9) + 7))
1627B - Not Sitting | 1663C - Pōja Verdon |
1497A - Meximization | 1633B - Minority |
688B - Lovely Palindromes | 66B - Petya and Countryside |
1557B - Moamen and k-subarrays | 540A - Combination Lock |
1553C - Penalty | 1474E - What Is It |
1335B - Construct the String | 1004B - Sonya and Exhibition |
1397A - Juggling Letters | 985C - Liebig's Barrels |
115A - Party | 746B - Decoding |
1424G - Years | 1663A - Who Tested |
1073B - Vasya and Books | 195B - After Training |
455A - Boredom | 1099A - Snowball |
1651D - Nearest Excluded Points | 599A - Patrick and Shopping |
237A - Free Cash | 1615B - And It's Non-Zero |
1619E - MEX and Increments | 34B - Sale |
1436A - Reorder | 1363C - Game On Leaves |