#include<iostream>
using namespace std;
int main()
{
int m,n,a[10000] = { 0 };
cin >> m>>n;
int count = m;
int i = 1,j=1;
do
{
if (j > n)j = 1;
if (i > m)i = 1;
if (a[i] == 0)
{
if (j == n)
{
a[i] = 1;
count--;
}j++;
}
i++;
}while (count > 1);
for (int i = 1; i <= m; i++)
{
if (a[i] == 0)
{
cout << i<< endl;
break;
}
}
return 0;
}