UVA 10170 Java

import java.util.*;
import static java.lang.System.*;
public class main{
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    while(sc.hasNextInt())
    {
   		long p = sc.nextLong();
    	long d = sc.nextLong();
    	long s = p;
    	while(s < d)	
    		s += ++p;
    	System.out.println(p);
    }
  }
};