import copy
import sys

N=int(input())

if N==1:
    print(1)
    sys.exit()

DP=[0]*15

DP[1]=1

for i in range(2,N+1):
    NDP=[0]*15
    for j in range(1,i):
        for k in range(j,i+1):
            NDP[k]+=DP[j]

    DP=NDP


        
print(sum(DP))