public class Main {
public static void main(String[] args) {
long min=100000000;
for(long x=2020;x<=10000;x++) {
for(long y=2021;y<=10000;y++) {
if(y>x&&((y*y-x*x)==(x*x-2019*2019))) {
min=Math.min(min, x+y);
}
}
}
System.out.println(min);
}
}