#include <bits/stdc++.h>
using namespace std;
int main() {
  double n, x, y, num1, num2, ans;
  int res;
  cin >> n >> x >> y;
  num1 = x / n;
  num2 = y / 100;
  if (num1 >= num2) {
    cout << 0;
  } else {
    ans = (num2 - num1) * n;
    res = ans;
    if ((ans - res) > 0) {
      res++;
      cout << res;
    } else {
      cout << ans;
    }
  }
  return 0;
}
