#include <bits/stdc++.h>
using namespace std;

int main() {
  int p, q, a;
  cin >> p >> q >> a;
  if (p < q) {
    cout << (int)1e9 << '\n';
    return 0;
  }
  if (p == q) {
    if (a) {
      cout << (int)1e9 << '\n';
    } else {
      cout << 0 << '\n';
    }
    return 0;
  }
  assert(false);
  int res = 0;
  for (int r = 1; r <= 100; ++r) {
    int num = a - (p * r / 100 - q * r / 100);
    int den = p - q;
    res += max((num + den - 1) / den, 0);
  }
  cout << res << '\n';
}