void main()
{
int i,j,n, m, a[100],count;
scanf("%d %d",&n,&m);
for(i = 0; i < 2*n; i ++)
{
a[i] = 1;
}
i = 0, j = 1, count = 0;
while(count < n)
{
if(a[i] == 1)
{
if(j ==m)
{
a[i] = 0;
j = 1;
count++;
}
else
j ++;
}
i = (i + 1) % (2 * n);//循环i++
}
i = (i + 2 * n- 1) % (2*n);//循环i--
j = 1;
while(count < (2 * n)-1)
{
if(a[i] == 1)
{
if(j == m)
{
a[i] = 0;
j = 1;
count++;
}
else
j ++;
}
i = (i + 2 * n- 1) % (2 * n);//循环i--
}
for(i = 0; i < (2 * n); i ++)
{
if(a[i] == 1)
printf("%d\n",i);
}
//while(1);
}
//自己一步一步验算了一遍，还是搞不懂
