#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  double people, wizards, porcent;
  cin >> people >> wizards >> porcent;
  double aux = people / 100;
  aux = ceil(aux * porcent);
  if (wizards >= aux)
    aux = 0;
  else
    aux = abs(aux - wizards);
  cout << aux;
  return 0;
}
