#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


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

//INSERT ABOVE HERE
const Int MAX = 1e9;
Int p,q,a;
Int check(Int k){
  return (k*p/100)<(k*q/100+a);
}
signed main(){
  cin>>p>>q>>a;
  if(p<=q&&a>0) drop(MAX);
  if(p>=q&&a==0) drop(0);

  Int l=0,r=MAX;
  while(l+1<r){
    Int m=(l+r)>>1;
    if(check(m)) l=m;
    else r=m;
  }
  const Int LEN=1e7;
  Int pos=l-LEN;
  chmax(pos,1);

  Int ans=pos-1;
  for(Int i=1;i<=MAX&&i-pos<LEN*2;i++) ans+=check(i);
  cout<<ans<<endl;
  return 0;
}