题目：

1 #include 
     
       2 using namespace std; 3 typedef long long ll; 4 const int INF = 0x3f3f3f3f; 5 const int M = 1178706+3; 6  7 int n, m; 8 int main()  { 9     while( ~scanf("%d %d", &n, &m ) )   {10         if( n == 1 )    {11             printf("1\n");12             continue;13         }14         if( m > n/2 )15             printf("%d\n", m-1 );16         else17             printf("%d\n", m+1 );18     }   19     return 0;20 }