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

int main() {
  int P, Q, A; {
    cin >> P >> Q >> A;
  }

  if (P <= Q) {
    if (A) cout << 1000000000 << endl;
    else cout << 0 << endl;
  } else {
    int x = A * 100 / (P - Q) + 200;
    int res = 0;
    while (x > 0) {
      res += (x + (int64_t) Q * x / 100 + A) > (x + (int64_t) P * x / 100);
      --x;
    }
    cout << res << endl;
  }
}