#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( Q >= P){ cout << MAX_X << endl; return 0;}
  
  ll left = 0; ll right = MAX_X;
  
  while(right-left > 1){
    
    ll x =(right+left)/2;
    
    if( (ll)((x*P)/100) - (ll)((x*Q)/100) < A){  left = x;}
    else{ right = x;}
  }
  
  cout << left << endl; return 0;
}