text: /*
  Author: Pakkpon Phongthawee
  LANG: C
  Problem:
  */
  #include<stdio.h>
  int main(){
      double w,h;
      scanf("%lf %lf",&w,&h);
      if(h>0&&w>0){
          h/=100;
          printf("%.2f",w/(h*h));
      }else{
          printf("invalid");
      }
      return 0;
  }
  