#include<stdio.h>

 #include<stdlib.h>

 int main()

 {

  int a,b,c;

  double s;

 while(scanf("%d%d%d",&a,&b,&c)&&(a!=0&&b!=0&&c!=0)){

 s=a*1.0/b;

  printf("%.*lf\n",c,s);}

  return 0;

 }