#include <stdio.h>

const int mod = 1000000007;
const int inv2 = 500000004;

int main(){
  int n, i, ans;
  scanf("%d",&n);
  ans = 1;
  for(i=2;i<=2*n;i++){
    ans = (long long) ans * i % mod;
  }
  for(i=0;i<n;i++){
    ans = (long long) ans * inv2 % mod;
  }
  printf("%d\n", ans);
  return 0;
}