#include<iostream>

using namespace std;

int main(){
	int n, a, b, c, d, num;
	while (cin >> n){
		num = 0;

		for (a = 0; a <= 1000; ++a){
			for (b = 0; b <= 1000; ++b){
				for (c = 0; c <= 1000; ++c){
					for (d = 0; d <= 1000; ++d){
						if (a + b + c + d == n)
							++num;
					}
				}
			}
		}
		cout << num << endl;

	}

	return 0;
}