#include <iostream>
using namespace std;
int main(){
  long long a,b,c;cin>>a>>b>>c;
  if(a==b){
    if(c){
      cout << 1000000000 << endl;
    }else{
      cout << 0 << endl;
    }
    return 0;
  }
  long long mx = 1000000000;
  long long mn = 1;
  while(mx-mn > 1){
    long long ce = (mx+mn)/2;
    if(ce*(100+a)/100 < ce*(100+b)/100+c){
      mn = ce;
    }else{
      mx = ce;
    }
  }
  long long mx2 = 1000000000;
  long long mn2 = 1;
  while(mx2-mn2 > 1){
    long long ce = (mx2+mn2)/2;
    if(ce*(100+a)/100 <= ce*(100+b)/100+c){
      mn2 = ce;
    }else{
      mx2 = ce;
    }
  }
  int ans = mn;
  for(int i = mn+1;mn2 >= i;i++){
    if(i*(100+a)/100 < i*(100+b)/100+c)ans++;
  }
  cout << ans << endl;
  

}