#include <bits/stdc++.h>
using namespace std;
int main() {
  double n, x, y;
  cin >> n >> x >> y;
  if ((x / n) * 100 >= y)
    cout << 0 << "\n";
  else {
    cout << (int)((n * y) / 100.0 - x) + 1 << "\n";
  }
  return 0;
}
