#include <bits/stdc++.h>
using namespace std;
int main(int qtd, char* nome[]) {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, x, y;
  cin >> n >> x >> y;
  int people = ceil(n * y / 100.0);
  cout << (x >= people ? 0 : people - x) << endl;
  return 0;
}
