#include <stdio.h>
#include <stdlib.h>

int lastRemaining(int n, int m) {
    int *people = (int *)malloc(n * sizeof(int));
    int i;
    for (i = 0; i < n; i++) {
        people[i] = 1;
    }
    
    int remaining = n;
    int count = 0;
    int index = 0;

    for (i = 0; remaining > 1; i = (i + 1) % n) {
        if (people[index] == 1) {
            count++;
            if (count == m) {
                people[index] = 0;
                count = 0;
                remaining--;
            }
        }
        index = (index + 1) % n;
    }
    
    int result = 0;
    for (i = 0; i < n; i++) {
        if (people[i] == 1) {
            result = i + 1;
            break;
        }
    }
    
    free(people);
    return result;
}

int main() {
    int n, m;
    scanf("%d %d", &n, &m);
    
    int result = lastRemaining(n, m);
    printf("%d", result);
    
    return 0;
}