INF = 10 ** 9
MOD = 10 **9 + 7
import sys
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)
import numpy as np

def main():
    n = int(input())
    ans = 10
    dp1 = np.ones(10,dtype = np.int64)
    for i in range(n - 1):
        if i == 0:
            dp2 = dp1[1:].cumsum()
            dp2 %= MOD
        else:
            dp2 = dp1.cumsum()
            dp2 %= MOD
        ans += dp2.sum()
        ans %= MOD
        dp1 = dp2
    print(ans)
if __name__=='__main__':
    main()