#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>using namespace std;int f[6][50];int main(){ memset(f, 0, sizeof(f)); f[0][0] = 1; for (int i = 1; i <= 5; i++) for (int j = 0; j <= 9*i; j++) for (int k = 0; k <= 9; k++) { if (k > j) break; f[i][j] += f[i - 1][j - k]; } int n; scanf("%d", &n); n /= 2; int ans = 0; for (int i = 0; i <= n * 9; i++) ans += f[n][i] * f[n][i]; printf("%d", ans); return 0;}
