#include <string.h>
#include <stdio.h>
__int64 N,M;
int i,j;
__int64 k;
double CGB,temp;

int main()
{
 scanf("%I64d%I64d%lf",&N,&M,&CGB);
 if (N<=M)
{
printf("0\n");
return 0;
}
 k=0;
 while (N>=M)
 {
   temp=(CGB/100)*N;
   N-=temp;
   k++;
  }

 printf("%I64d\n",k);

 return 0;
}

SORRY,EXCOURSE ME FOR MY ENGLISH AND STUPID MISTAKE!
Now I have AC with 0.001 sec and 136 kb.

Edited by author 11.04.2008 21:10