#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,k; cin>>n>>k; if(n%k>=1 && n%k<=k){ cout<<n%k+1; } else cout<<n%k; return 0; }