#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  int ans = ceil((float(n) * float(y)) / 100);
  if (x >= ans) {
    cout << "0" << endl;
  } else {
    cout << ans - x << endl;
  }
  return 0;
}
