#include <iostream>
using namespace std;

int main() {
  double p, q, a; cin >> p >> q >> a; int an = 0;
  for(int i=1; i<1e7+10; i++) {
    int s = i * (100 + p) / 100;
    int t = i * (100 + q) / 100 + a;
    if (s < t) an++;
  }
  if (an == 1e7+9) cout << 1000000000 << endl;
  else cout << an << endl;
}