#include <bits/stdc++.h>

using namespace std;

typedef long long  ll;
typedef unsigned long long ull;
typedef map <int, int> mii;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

int const maxn = int(1e5 + 12);
int const maxb = int(2e6 + 12);
int const inf = int(1e9 + 7);
ll const linf = ll(1e18 + 12);
double const eps = 1e-7;
double const pi = acos(-1);
#ifdef _WIN32
    #define I64 "%I64d"
#else
    #define I64 "%lld"
#endif
#define mp make_pair
#define pb push_back
#define F first
#define S second
//#define fn ""

ll dp[15][20];

int n;

ll rec(int len, int last)
{
    if (len == n)
        return 1;
    ll & ans = dp[last][len];
    if (ans != -1)
        return ans;
    ans = 0;
    for (int i = 0; i < 10; i++)
        if (i != last)
            ans += rec(len + 1, i);
    return ans;
}

int main()
{
    #ifdef fn
        freopen(fn".in", "r", stdin);
        freopen(fn".out", "w", stdout);
    #endif
    scanf("%d", &n);
    memset(dp, -1, sizeof(dp));
    printf(I64, rec(0,  0));
}