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