N = int(input()) dp = [0 for i in range(16)] dp[0] = 4 dp[1] = 9 for i in range(2, N + 1): s = 4 ** (i - 1) root = s ** (1/2) dp[i] = dp[i - 1] + 5 * s - 2 * root * (root - 1) print(int(dp[N]))
기본 구현