#include<stdio.h>
#include<stdlib.h>
#include<math.h>

typedef long long int int64;

#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)<(b)?(a):(b))
#define ABS(a) ((a)>(0)?(a):-(a))

int fact(int n,int mod){
  int res=1;
  int i;
  for(i=1;i<=n;i++) res=(int64)res*i%mod;
  return res;
}

int modPow(int r,int n,int mod){
  int t=1;
  int s=r;
  while(n>0){
    if(n&0x01) t=(int64)t*s%mod;
    s=(int64)s*s%mod;
    n>>=1;
  }
  return t;
}

void run(void){
  int n;
  scanf("%d",&n);
  const int mod=1000000007;
  int ans=(int64)fact(2*n,mod)*modPow(modPow(2,mod-2,mod),n,mod)%mod;
  printf("%d\n",ans);
}

int main(void){
  run();
  return 0;
}