#include <bits/stdc++.h>
const long long INF = 1000000007;
const double cp = 2 * asin(1.0);
const double eps = 1e-9;
const long long mod = 1000000007;
using namespace std;
int main() {
  cin.tie(NULL);
  ios_base::sync_with_stdio(false);
  double n, x;
  double y;
  cin >> n >> x >> y;
  double p = double(n * y) / 100.0;
  double res = p - x;
  long long ans = (long long)res;
  if (res - float(res) != 0) ans++;
  double P = double((x + ans) * 100) / double(n);
  while (P < y) {
    ans++;
    P = double((x + ans) * 100) / double(n);
  }
  cout << ans;
  return 0;
}
