#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,m,t=0,s=0,r=0; bool a[301]={}; cin>>n>>m; while(r!=n-1){ t++; if(t>n)t=1; if(!a[t])s++; if(s==m){ s=0; a[t]=1; r++; } } else cout<<s; return 0; }