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#include <iostream>
#include <string>
#include <sstream>

using namespace std;

string add(long long int a, long long int b){
	string out = "";
	int greater = 0;
	if(a > b) {
		greater = a;
	}
	else {
		greater = b;
	}
	while(greater > 0){
		int aLast = a % 10;
		int bLast = b % 10;
		int c = aLast + bLast;
		stringstream ss;
		ss << c;
		string val = ss.str();
		string temp = out;
		out = val + temp;
		a /= 10;
		b /= 10;
		greater /= 10;
	}
	return out;
}


int main(){
	
	unsigned long long int input = 1010;
	stringstream ss;
	ss << input;
	string inputS = ss.str();
	

	long long int output = 0;
	for(long long int i = 0; i <= input; i++){
		for(long long int j = input; j >= 0; j--){
			if(add(i, j) == inputS){
				output++;
			}
		}
	}
	
	cout << output << endl;
	
	return 0;
}