#include<stdio.h>
main()
{int a,b,c;
while(scanf("%d %d %d",&a,&b,&c)!=EOF){
printf("%d.",(a-a%b)/b);
a=a%b;
while(c>0){
a*=10;
printf("%d",(a-a%b)/b);
a=a%b; c--;
}
printf("\n");
}

}