int main(){
	int sn[1000],sm[1000],NUM=0;
	for(int p=0;p<1000;p++){
		int a1,a2;
		scanf("%d%d",&a1,&a2);
		if((a1==0)&&(a2==0)){
			break;
			}
		else{sn[p]=a1;
		     sm[p]=a2;
			 NUM++;
		}
	}
	int k=1;
	for(int t=0;t<NUM;t++){
       for (int i=1;i<=sn[t];i++){
	       k=(k+sm[t]-1)%i+1;}
           printf("%d\n",k);
	}
	return 0;
}