/*
 * hanshu-ditui_4.cpp
 * Name:?????
 *  Created on: 2010-11-21
 *      Author: Wang Ju
 */

int main(){
	int a[100]={0},n,k,i;//??????????????????????
	cin>>n>>k;           //??????????????????
	if(n>2)              //??n????2
	{a[1]=n+k;           //??????????????n+k???????
	while(true)
         {for(i=2;i<=n;i++) /*???????????????????n?????k?????for??*/
		  {a[i]=(a[i-1]-k)/n*(n-1);
	       if((a[i]%n)!=k) break;}
	   if(i==(n+1)) break;//???????????i=n+1???while??
	   else a[1]=a[1]+n;  //???a[1]????n????
	  }
	cout<<a[1]<<endl;}   //????????????????????
	else                 //??n???2?k???1???????7
	  {a[1]=7;
       cout<<a[1]<<endl;}
return 0;
}
