#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t, n, y;
  cin >> n >> t >> y;
  float temp = n * y;
  temp = temp / 100.00;
  long long x = ceil(temp);
  cout << x - t << "\n";
  return 0;
}
