#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, y, x;
  cin >> n >> y >> x;
  double sum = (double)n * x / 100;
  double sum2 = (double)sum - y;
  if (sum2 > 0 && sum2 < 1)
    cout << 1;
  else if (sum2 < 0)
    cout << 0;
  else
    cout << sum2;
  return 0;
}
