Poj Solution 2773

http://poj.org/problem?id=2773

//* @author: 82638882@163.com
import java.util.*;
public class Main
{
 public static void main(String[] args)
 {
  Scanner in=new Scanner(System.in);
  while(in.hasNext())
  {
    int a=in.nextInt();
    int b=in.nextInt();
    if(a==1)System.out.println(b);
    else{
     ArrayList< Integer> arr=new ArrayList< Integer>();
     for(int i=1;i< a;i++)
     {
      int m=a,n=i;
      while(m%n!=0)
       {
        int w=m;
        m=n;
        n=w%n;
       }
      if(n==1) arr.add(i);
      }
       int c=arr.size();
       int k=b/c;
       int u=b%c;
       if(u==0){
        u=c;
        k-=1;
       }
    System.out.println(a*k+arr.get(u-1));
    }
    }
  }
}