UVa 11723 Numbering Roads Solution

#include <cstdio>

int main(void){
 int R, N;
 for(int cnum = 0; (scanf("%d %d", &R, &N) && R); ){
  printf("Case %d: ", ++cnum);
  int s = (R - 1)/N;
  if(s > 26) printf("impossible\n");
  else printf("%d\n", s);
 }
 return 0;
}