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