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