#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;
  }
  auto chk = [&](long long x) -> bool {
    return x * (100 + p) / 100 < x * (100 + q) / 100 + a;
  };
  int res = 0;
  for (int r = 1; r <= 100; ++r) {
    int ok = -1, ng = 1e7;
    while (ng - ok > 1) {
      int mid = (ok + ng) / 2;
      (chk(100 * mid + r) ? ok : ng) = mid;
    }
    res += ok + 1;
  }
  cout << res << '\n';
}