codeforces 808A Lucky Year

#include<iostream>
#include<vector>
#include<string>
#include<set>
#include<map>
#include<algorithm>
#include<queue>
#include<list>
#include<stack>
#include<cstdio>
#include<fstream>
#include<numeric>
#include<functional>
#include<utility>
#include<memory>
using namespace std;

string year;//900000000
//1000000000
long int sub(string first, string second){
	if (second.size() == 1) return 1;
	long int t = 1;
	long int res = 0;
	if (first.size() > second.size()){
		bool flag = true;
		string temp(second.size(), '9');
		for (int i = second.size() - 1; i >= 0; i--){
			res += (9 - (second[i] - '0'))*t;
			t *= 10;
		}
		res += 1;
		return res;
	}
	for (int i = first.size() - 1; i > 0; i--){
		if (t == 1){
			res += (10 - (second[i] - '0'))*t;
		}
		else{
			res += (9 - (second[i] - '0'))*t;
		}
		t = t * 10;
	}
	return res;
}

int main(){
	while (cin >> year){
		int length = year.length();
		string temp(length, '0');
		if (year[0] == '9'){
			temp.insert(temp.begin(), '1');
		}
		else{
			temp[0] = (year[0] - '0') + 1 + '0';
		}
		long int res = sub(temp, year);
		cout << res << endl;
	}
	return 0;
}