Codeforces Round #316 (Div. 2B) 570B Simple Game 贪心

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 #include <bits/stdc++.h>
 using namespace std;
 typedef long long ll;
 const int INF = 0x3f3f3f3f;
 const int M = +;

 int n, m;
 int main()  {
     while( ~scanf("%d %d", &n, &m ) )   {
         if( n ==  )    {
             printf("1\n");
             continue;
         }
         if( m > n/ )
             printf("%d\n", m- );
         else
             printf("%d\n", m+ );
     }
     return ;
 }