n = int(input())

mod = 10**9 + 7
DP = [[0 for _ in range(10)] for _ in range(n)]
for i in range(10):
    DP[0][i] = 1
for i in range(n - 1):
    for j in range(10):
        for k in range(j, 10):
            DP[i + 1][k] += DP[i][j]
            DP[i + 1][k] %= mod
ans = 0
for i in range(10):
    ans += DP[-1][i]
    ans %= mod
print(ans)