#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  unsigned int citizens, wizard, percentage;
  cin >> citizens >> wizard >> percentage;
  citizens = ceil((float)(percentage) / 100 * citizens);
  cout << ((citizens > wizard) ? citizens - wizard : 0);
}
