import java.util.Scanner;
class Combinations {
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
int M=-1,N=-1;
while((M!=0)&&(N!=0)){
N=s.nextInt();
M=s.nextInt();
long C,a=1,b=1;
for (int i = 1; i <=M; i++) {
a*=(N-i+1);
b*=i;
}
C=a/b;
System.out.println(N+" things taken "+M+" at a time is "+C+" exactly");
}
}
}
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