#include <iostream>
#include <stdio.h>
#include <vector>
#include <algorithm>
#include <set>
#include <string>
#include <map>
#include <queue>
#include <cmath>
#include <algorithm>
#pragma comment(linker, "/STACK:550000000")

using namespace std;

int get_ans(int n, int p) {
	if (n == 1)
		return 1;
	else return ((get_ans(n - 1, p) + p - 1) % n + 1);
}


int main() {

	freopen("joseph.in", "r", stdin);
	freopen("joseph.out", "w", stdout);

	int n, p;
	scanf("%d%d", &n, &p);
	int ans = get_ans(n, p);
	cout << ans;
	//system("pause");
	return 0;
}