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