PY

def main():
    n = int(input().strip())
    dp = [0] * (n + 1)
    dp[1] = 1
    for i in range(2, n + 1):
        dp[i] = 1
        for j in range(1, i // 2 + 1):
            dp[i] += dp[j]
    print(dp[n])

if __name__ == "__main__":
    main()