#include <bits/stdc++.h>
using namespace std;
double n, y, needed;
int x, ndd;
int main() {
  cin >> n >> x >> y;
  needed = n * y / 100;
  ndd = needed + 0.9;
  if (x >= ndd)
    cout << "0";
  else
    cout << abs(x - ndd);
  return 0;
}
