#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  float per = y / 100.0;
  int adm = ceil(per * n);
  if (x >= adm)
    cout << 0 << endl;
  else
    cout << adm - x << endl;
}
