N = int(input())

dp = [[0]*14 for _ in [0]*14]
dp[0][0] = 1
for i in range(1, N+1):
    for j in range(N+1):
        if j - i >= 0:
            dp[i][j] = dp[i][j-1] + dp[i-1][j]
        else:
            dp[i][j] = dp[i-1][j]

print(dp[N][N])