#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
long long n,k;
int main(){
	cin>>n>>k;
	if(n&1){
		cout<<(k-1+(k-1)/(n>>1))%n+1;
	}else cout<<(k-1)%n+1;
	return 0;
}