n = int(input())
print((pow(3, n * 3) - pow(7, n)) % (pow(10, 9) + 7))
22E - Scheme | 1566A - Median Maximization |
1278A - Shuffle Hashing | 1666F - Fancy Stack |
1354A - Alarm Clock | 1543B - Customising the Track |
1337A - Ichihime and Triangle | 1366A - Shovels and Swords |
919A - Supermarket | 630C - Lucky Numbers |
1208B - Uniqueness | 1384A - Common Prefixes |
371A - K-Periodic Array | 1542A - Odd Set |
1567B - MEXor Mixup | 669A - Little Artem and Presents |
691B - s-palindrome | 851A - Arpa and a research in Mexican wave |
811A - Vladik and Courtesy | 1006B - Polycarp's Practice |
1422A - Fence | 21D - Traveling Graph |
1559B - Mocha and Red and Blue | 1579C - Ticks |
268B - Buttons | 898A - Rounding |
1372B - Omkar and Last Class of Math | 1025D - Recovering BST |
439A - Devu the Singer and Churu the Joker | 1323A - Even Subset Sum Problem |