#include <stdio.h>
#include <math.h>
int main()
{
    float a,b,c;
    int i;
    scanf("%f %f %f",&a,&b,&c);
    i=log(b/a)/log((100-c)/100)+1;
    printf("%d",i);

}

it's simple code fails on fourth test... (WA#4)
What can it be ?

Here is my code:

Program Acm_Timus_1283;
var
  i,k0,km:longint;
  n,log:real;
begin
  Readln(k0,km,n);
  n:=(100-n)/100;
  log:=((ln(km)-ln(k0))/ln(n));
  i:=trunc(log);
  if log-trunc(log)>0.0000000001 then
  inc(i);
  Writeln(i);
end.


Wa#4 too(((

I had WA4 too. But then  found my mistake(noting to do with precision, actually:)). The thing is that if first number is less or equal that the second then 0 should be output. I suo=ppose your program outputs a negative number:)

No doubt, if the dwarf has less money than he should have for his life not to be senseless, he doesn't live at all. When I corrected this mistake, i got AC instead WA#4.