n=int(input()) from functools import reduce dp=[1]*(n+1) if n<2: print(dp[n]) else: for i in range(2,n+1): dp[i]=reduce(lambda x,y:x+y, dp[:i]) print(dp[n])
n=int(input()) from functools import reduce dp=[1]*(n+1) if n<2: print(dp[n]) else: for i in range(2,n+1): dp[i]=reduce(lambda x,y:x+y, dp[:i]) print(dp[n])
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