#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll MAX_X = 1e9;
int main(){
  ll P,Q,A; cin >> P >> Q >> A;
  if(  P == Q){
    if( A == 0){ cout << MAX_X << endl;} else { cout << 0 << endl;}
    return 0;
  }
  
  ll bnd = 100*(A+1);
  ll cnt = 0;
  for(ll x = 1; x < bnd; x++){
    if( (ll)((x*P)/100) - (ll)((x*Q)/100) < A){ cnt++;}
  }
  
  ll res = (ll)((MAX_X*P)/100)-(ll)((MAX_X*Q)/100);
  
  if( res < A){ cnt += MAX_X-bnd+1;}
  
  cout << cnt << endl; return 0;
}