#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-Ofast")
using namespace std;
const long long MAX = 1e7;
const long long MOD = 1e9 + 7;
const long long MAAX = 1e18;
long long main() {
  ios_base::sync_with_stdio(0);
  long long tc = 1;
  while (tc--) {
    long long a, b, c, x;
    cin >> a >> b >> c;
    x = (long long)(ceil(1.0 * (c / 100.0) * a));
    cout << max(0ll, (long long)(x - b)) << endl;
  }
  return 0;
}
