#include<iostream>
using namespace std;
int main(){
  unsigned long long  a,n,i,k,j,l,count=0;
  while(cin >> n){
    count=0;
    for(i=0;i<=1000;i++){
      for(j=0;j<=1000;j++){
	for(k=0;k<=1000;k++){
	  for(l=0;l<=1000;l++){
	    a=i+j+k+l;
	    if(a==n)count+=1;
	  }
	}
      }
    }
    cout<<count<<endl;
  }
  return 0;
}