#include <bits/stdc++.h>
using namespace std;
int main() {
  float n, x, y;
  float lt = 100;
  cin >> n >> x >> y;
  int tt = ceil((y * n) / lt) - x;
  if (tt >= 0)
    cout << tt << endl;
  else
    cout << "0" << endl;
  return 0;
}
