#include<bits/stdc++.h>

#pragma GCC optimize("O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;

struct FastIO{
  FastIO(){
    cin.tie(0);
    ios::sync_with_stdio(0);
  }
}fastio_beet;

template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}

//INSERT ABOVE HERE
signed main(){
  long long p,q,a;
  cin>>p>>q>>a;

  const int MAX = 1e9;
  if(p<=q) drop(MAX);

  int ans0=0;
  int ans1=0;
  int ans2=0;
  int ans3=0;
  int ans4=0;
  int ans5=0;
  int ans6=0;
  int ans7=0;
  for(int i=1;i<MAX;i+=8){
    ans0+=((i+0)*p/100)<((i+0)*q/100)+a;
    ans1+=((i+1)*p/100)<((i+1)*q/100)+a;
    ans2+=((i+2)*p/100)<((i+2)*q/100)+a;
    ans3+=((i+3)*p/100)<((i+3)*q/100)+a;
    ans4+=((i+4)*p/100)<((i+4)*q/100)+a;
    ans5+=((i+5)*p/100)<((i+5)*q/100)+a;
    ans6+=((i+6)*p/100)<((i+6)*q/100)+a;
    ans7+=((i+7)*p/100)<((i+7)*q/100)+a;
  }
  int ans=0;
  ans+=ans0;
  ans+=ans1;
  ans+=ans2;
  ans+=ans3;
  ans+=ans4;
  ans+=ans5;
  ans+=ans6;
  ans+=ans7;
  cout<<ans<<endl;
  return 0;
}